#include <bits/stdc++.h>
using namespace std;
const int MAXN = 410000;
struct st {
  int l, r, n, ans;
};
st qq[MAXN];
int n;
int tm;
int h[MAXN];
vector<int> eds[MAXN];
int go[MAXN];
int ans[MAXN];
int was[MAXN];
bool cmp(st a, st b) { return a.r != b.r ? a.r > b.r : a.l < b.l; }
struct node {
  int go[26];
  int suf, len;
};
node mem[MAXN];
int last;
int memcnt;
int newn() {
  memset(mem[memcnt].go, 255, sizeof(mem[memcnt].go));
  mem[memcnt].suf = -1;
  mem[memcnt].len = 0;
  return memcnt++;
}
void addc(int c) {
  int p = last;
  last = newn();
  mem[last].len = mem[p].len + 1;
  while (p != -1 && mem[p].go[c] == -1) mem[p].go[c] = last, p = mem[p].suf;
  if (p == -1) {
    mem[last].suf = 0;
    return;
  }
  int q = mem[p].go[c];
  if (mem[q].len == mem[p].len + 1) {
    mem[last].suf = q;
  } else {
    int cl = newn();
    mem[cl] = mem[q];
    mem[q].suf = cl;
    mem[last].suf = cl;
    mem[cl].len = mem[p].len + 1;
    while (p != -1 && mem[p].go[c] == q) mem[p].go[c] = cl, p = mem[p].suf;
  }
}
vector<int> qv[MAXN];
pair<int, int> rmq[MAXN * 4];
int gr[MAXN];
int pl[MAXN];
int pp[MAXN];
int tin[MAXN];
int tout[MAXN];
void build(int v, int tl, int tr) {
  rmq[v] = make_pair(-1, -1);
  if (tl + 1 == tr) return;
  int m = (tl + tr) >> 1;
  build(v * 2 + 1, tl, m);
  build(v * 2 + 2, m, tr);
}
void upd(int v, int tl, int tr, int x) {
  if (tl + 1 == tr) {
    if (qv[x].empty())
      rmq[v] = make_pair(-1, -1);
    else
      rmq[v] = make_pair(qq[qv[x].back()].l, qv[x].back());
    return;
  }
  int m = (tl + tr) >> 1;
  if (tin[x] < m)
    upd(v * 2 + 1, tl, m, x);
  else
    upd(v * 2 + 2, m, tr, x);
  rmq[v] = max(rmq[v * 2 + 1], rmq[v * 2 + 2]);
}
pair<int, int> get(int v, int tl, int tr, int x) {
  if (tr <= tin[x] || tout[x] <= tl) return make_pair(-1, -1);
  if (tin[x] <= tl && tr <= tout[x]) return rmq[v];
  int m = (tl + tr) >> 1;
  return max(get(v * 2 + 1, tl, m, x), get(v * 2 + 2, m, tr, x));
}
void buildrmq() { build(0, 0, n); }
void dfs(int v) {
  tin[v] = tm++;
  h[v] = 0;
  for (int u : eds[v]) {
    dfs(u);
    h[v] = max(h[v], h[u] + 1);
  }
  tout[v] = tm;
}
int cls = 1;
struct hld {
  vector<int> vv;
  vector<pair<int, int>> ed;
  vector<pair<int, int>> rmq;
  vector<pair<int, int>> rmqed;
  vector<int> nx;
  int p;
  void add(int v) { vv.push_back(v); }
  void init(int k) {
    for (int i = 0; i < (int)vv.size(); ++i) gr[vv[i]] = k, pl[vv[i]] = i;
    nx.resize(vv.size());
    for (int i = 0; i < (int)vv.size(); ++i) {
      for (int u : eds[vv[i]])
        if (i == (int)vv.size() - 1 || u != vv[i + 1])
          ed.push_back(make_pair(vv[i], u)), pp[u] = ed.size() - 1;
      nx[i] = ed.size();
    }
    rmq.resize(vv.size() * 4, make_pair(-1, -1));
    rmqed.resize(ed.size() * 4, make_pair(-1, -1));
  }
  void updv(int v, int tl, int tr, int x, pair<int, int> y) {
    if (tl + 1 == tr) {
      rmq[v] = y;
      return;
    }
    int m = (tl + tr) >> 1;
    if (x < m)
      updv(v * 2 + 1, tl, m, x, y);
    else
      updv(v * 2 + 2, m, tr, x, y);
    rmq[v] = max(rmq[v * 2 + 1], rmq[v * 2 + 2]);
  }
  void updv(int x, pair<int, int> y) { updv(0, 0, (int)vv.size(), x, y); }
  void upde(int v, int tl, int tr, int x, pair<int, int> y) {
    if (tl + 1 == tr) {
      rmqed[v] = y;
      return;
    }
    int m = (tl + tr) >> 1;
    if (x < m)
      upde(v * 2 + 1, tl, m, x, y);
    else
      upde(v * 2 + 2, m, tr, x, y);
    rmqed[v] = max(rmqed[v * 2 + 1], rmqed[v * 2 + 2]);
  }
  void upde(int x, pair<int, int> y) { upde(0, 0, (int)ed.size(), x, y); }
  pair<int, int> getv(int v, int tl, int tr, int l, int r) {
    if (r <= tl || tr <= l) return make_pair(-1, -1);
    if (l <= tl && tr <= r) return rmq[v];
    int m = (tl + tr) >> 1;
    return max(getv(v * 2 + 1, tl, m, l, r), getv(v * 2 + 2, m, tr, l, r));
  }
  pair<int, int> getv(int l, int r) { return getv(0, 0, (int)vv.size(), l, r); }
  pair<int, int> gete(int v, int tl, int tr, int l, int r) {
    if (r <= tl || tr <= l) return make_pair(-1, -1);
    if (l <= tl && tr <= r) return rmqed[v];
    int m = (tl + tr) >> 1;
    return max(gete(v * 2 + 1, tl, m, l, r), gete(v * 2 + 2, m, tr, l, r));
  }
  pair<int, int> gete(int x) { return gete(0, 0, (int)ed.size(), 0, nx[x]); }
};
hld gg[MAXN];
void updv(int v) {
  if (qv[v].empty())
    gg[gr[v]].updv(pl[v], make_pair(-1, -1));
  else
    gg[gr[v]].updv(pl[v],
                   make_pair(mem[v].len + qq[qv[v].back()].l, qv[v].back()));
}
void upde(int u, int v) {
  assert(gr[u] != gr[v]);
  pair<int, int> x = get(0, 0, n, v);
  x.first += mem[u].len;
  gg[gr[u]].upde(pp[v], x);
}
void dfs2(int v, int cnt) {
  was[v] = 1;
  gg[cnt].add(v);
  if (eds[v].empty()) {
    gg[cnt].init(cnt);
    return;
  }
  int mx = -1;
  for (int u : eds[v])
    if (mx == -1 || h[u] > h[mx]) mx = u;
  dfs2(mx, cnt);
  for (int u : eds[v])
    if (!was[u]) {
      gg[cls].p = v;
      dfs2(u, cls++);
    }
}
void addq(int x) {
  qv[go[qq[x].r]].push_back(x);
  upd(0, 0, n, go[qq[x].r]);
  x = go[qq[x].r];
  updv(x);
  while (gg[gr[x]].p != -1) upde(gg[gr[x]].p, gg[gr[x]].vv[0]), x = gg[gr[x]].p;
}
void delq(int x, int p) {
  qq[x].ans = p;
  assert(qv[go[qq[x].r]].back() == x);
  qv[go[qq[x].r]].pop_back();
  upd(0, 0, n, go[qq[x].r]);
  x = go[qq[x].r];
  updv(x);
  while (gg[gr[x]].p != -1) upde(gg[gr[x]].p, gg[gr[x]].vv[0]), x = gg[gr[x]].p;
}
void solve(int v, int p) {
  while (true) {
    pair<int, int> x = get(0, 0, n, v);
    if (x.first + mem[v].len >= p)
      delq(x.second, p);
    else
      break;
  }
  while (true) {
    pair<int, int> x = gg[gr[v]].getv(0, pl[v] + 1);
    if (x.first >= p)
      delq(x.second, p);
    else
      break;
  }
  while (true) {
    pair<int, int> x = gg[gr[v]].gete(pl[v]);
    if (x.first >= p)
      delq(x.second, p);
    else
      break;
  }
  if (gg[gr[v]].p != -1) solve(gg[gr[v]].p, p);
}
char s[MAXN];
string t;
int hv[30];
int nnx[MAXN];
int ppr[MAXN];
int nx[MAXN];
int pr[MAXN];
namespace aba {
void zf(const string &s, int *z) {
  z[0] = 0;
  int l = 0, r = 0;
  for (int i = 1; i < s.size(); ++i) {
    if (r > i)
      z[i] = min(r - i, z[i - l]);
    else
      z[i] = 0;
    while (i + z[i] < s.size() && s[i + z[i]] == s[z[i]]) ++z[i];
    if (i + z[i] > r) r = i + z[i], l = i;
  }
  z[s.size()] = 0;
}
const int MAXN = 210000;
vector<int> gl[MAXN];
vector<int> gr[MAXN];
int fl1[MAXN];
int fl2[MAXN];
int fl[MAXN];
int tm1;
vector<pair<int, int>> dtmp;
void add(int l, int len) {
  gl[l].push_back(l + len * 2);
  gr[l + 2 * len].push_back(l);
}
int z1[MAXN];
int z2[MAXN];
vector<pair<int, int>> run2(string s, int len, int fll) {
  string tmp = s.substr(0, len);
  reverse(tmp.begin(), tmp.end());
  zf(tmp, z1);
  tmp = s.substr(len) + s.substr(0, len);
  zf(tmp, z2);
  ++tm1;
  vector<pair<int, int>> ans;
  for (int i = 1; i < len; ++i) {
    if (fl[i] == tm1) continue;
    int go = z1[i];
    for (int j = 2 * i; j <= i + go; j += i) fl[j] = tm1;
  }
  for (int i = 0; i < len; ++i) {
    int k = len - i;
    if (fl[k] == tm1) continue;
    if (s[i] != s[len]) continue;
    int gl = z1[k];
    int gr = z2[s.size() - len + i];
    gl = min(gl, k - 1);
    for (int j = gl; j >= fll; --j) {
      if (j + gr < k) break;
      ans.emplace_back(i - j, k);
    }
  }
  return ans;
}
string s;
int n;
void run(int l, int r) {
  if (l + 1 == r) return;
  int mid = (l + r) >> 1;
  run(l, mid);
  run(mid, r);
  auto tt = s.substr(l, r - l);
  vector<pair<int, int>> tmp = run2(tt, mid - l, 0);
  for (auto p : tmp) add(p.first + l, p.second);
  reverse(tt.begin(), tt.end());
  tmp = run2(tt, r - mid, 1);
  int xx = r - l - 1;
  for (auto p : tmp) {
    int oth = xx - p.first - 2 * p.second + 1;
    add(l + oth, p.second);
  }
}
vector<tuple<int, long long, long long>> dd[MAXN];
const long long MOD = 1e9 + 7;
long long dp[MAXN];
void solve() {
  s = t;
  n = s.size();
  run(0, n);
  for (int i = 0; i < n; ++i) {
    sort(gl[i].begin(), gl[i].end());
    if (!gl[i].empty()) {
      nnx[i] = gl[i][0];
    } else {
      nnx[i] = n + 1;
    }
  }
  for (int i = 1; i <= n; ++i) {
    sort(gr[i].begin(), gr[i].end());
    if (!gr[i].empty()) {
      ppr[i] = gr[i].back();
    } else {
      ppr[i] = -1;
    }
  }
}
};  // namespace aba
int rrr[MAXN * 4];
void build2(int v, int tl, int tr) {
  if (tl + 1 == tr) {
    rrr[v] = nnx[tl];
    return;
  }
  int m = (tl + tr) >> 1;
  build2(v * 2 + 1, tl, m);
  build2(v * 2 + 2, m, tr);
  rrr[v] = min(rrr[v * 2 + 1], rrr[v * 2 + 2]);
}
int rmqget(int v, int tl, int tr, int l, int r) {
  if (r <= tl || tr <= l) return n + 1;
  if (l <= tl && tr <= r) {
    return rrr[v];
  }
  int m = (tl + tr) >> 1;
  return min(rmqget(v * 2 + 1, tl, m, l, r), rmqget(v * 2 + 2, m, tr, l, r));
}
int tmp[26];
int main() {
  ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
  int qqq;
  int q = 0;
  cin >> n;
  cin >> t;
  aba::solve();
  build2(0, 0, n);
  fill(tmp, tmp + 26, n);
  for (int i = t.size() - 1; i >= 0; --i) {
    nx[i] = tmp[t[i] - 'a'];
    tmp[t[i] - 'a'] = i;
  }
  fill(tmp, tmp + 26, -1);
  for (int i = 0; i < t.size(); ++i) {
    pr[i] = tmp[t[i] - 'a'];
    tmp[t[i] - 'a'] = i;
  }
  for (int i = 0; i < n; ++i) s[i] = t[i];
  cin >> qqq;
  for (int i = 0; i < qqq; ++i) {
    int l, r;
    cin >> l >> r;
    --l;
    if (r - l <= 26) {
      memset(hv, 0, sizeof(hv));
      int fl = 0;
      for (int i = l; i < r; ++i) {
        if (hv[t[i] - 'a']) fl = 1;
        hv[t[i] - 'a'] = 1;
      }
      if (!fl) {
        ans[i] = -1;
        continue;
      }
    }
    ans[i] = 4;
    if (nx[l] < r || pr[r - 1] >= l) ans[i] = 3;
    if (rmqget(0, 0, n, l, r) <= r) ans[i] = 3;
    if (nnx[l] <= r || ppr[r] >= l) ans[i] = 2;
    qq[q].l = l;
    qq[q].r = r;
    qq[q].n = i;
    ++q;
  }
  sort(qq, qq + q, cmp);
  last = newn();
  for (int i = 0; i < n; ++i) addc(s[i] - 'a');
  int now = 0;
  go[0] = now;
  for (int i = 0; i < n; ++i) now = mem[now].go[s[i] - 'a'], go[i + 1] = now;
  for (int i = 0; i < memcnt; ++i)
    if (mem[i].suf != -1) eds[mem[i].suf].push_back(i);
  int n2 = n;
  n = memcnt;
  dfs(0);
  buildrmq();
  gg[0].p = -1;
  dfs2(0, 0);
  now = 0;
  for (int i = n2 - 1; i >= 0; --i) {
    while (now < q && qq[now].r > i) addq(now++);
    solve(go[i], i);
  }
  for (int i = 0; i < q; ++i) {
    int go = qq[i].ans - qq[i].l;
    int l = qq[i].l;
    int r = qq[i].r;
    if (go * 2 >= r - l && (r - l) % (r - l - go) == 0)
      ans[qq[i].n] = 1;
    else if (go != 0)
      ans[qq[i].n] = 2;
  }
  for (int i = 0; i < qqq; ++i) cout << ans[i] << "\n";
  return 0;
}

### Prompt

Create a solution in cpp for the following problem:

Ildar took a band (a thin strip of cloth) and colored it. Formally, the band has n cells, each of them is colored into one of 26 colors, so we can denote each color with one of the lowercase letters of English alphabet. 

Ildar decided to take some segment of the band [l, r] (1 ≤ l ≤ r ≤ n) he likes and cut it from the band. So he will create a new band that can be represented as a string t = s_l s_{l+1} … s_r.

After that Ildar will play the following game: he cuts the band t into some new bands and counts the number of different bands among them. Formally, Ildar chooses 1 ≤ k ≤ |t| indexes 1 ≤ i_1 < i_2 < … < i_k = |t| and cuts t to k bands-strings t_1 t_2 … t_{i_1}, t_{i_1 + 1} … t_{i_2}, …, {t_{i_{k-1} + 1}} … t_{i_k} and counts the number of different bands among them. He wants to know the minimal possible number of different bands he can get under the constraint that at least one band repeats at least two times. The result of the game is this number. If it is impossible to cut t in such a way, the result of the game is -1.

Unfortunately Ildar hasn't yet decided which segment he likes, but he has q segments-candidates [l_1, r_1], [l_2, r_2], ..., [l_q, r_q]. Your task is to calculate the result of the game for each of them.

Input

The first line contains one integer n (1 ≤ n ≤ 200 000) — the length of the band Ildar has.

The second line contains a string s consisting of n lowercase English letters — the band Ildar has.

The third line contains a single integer q (1 ≤ q ≤ 200 000) — the number of segments Ildar has chosen as candidates.

Each of the next q lines contains two integer integers l_i and r_i (1 ≤ l_i ≤ r_i ≤ n) denoting the ends of the i-th segment.

Output

Output q lines, where the i-th of them should contain the result of the game on the segment [l_i, r_i].

Example

Input

9
abcabcdce
7
1 6
4 7
5 9
6 9
1 9
3 6
4 4


Output

1
-1
4
3
2
2
-1

Note

Consider the first example.

If Ildar chooses the segment [1, 6], he cuts a string t = abcabc. If he cuts t into two bands abc and abc, the band abc repeats two times and the number of different tapes is 1. So, the result of this game is 1.

If Ildar chooses the segment [4, 7], he cuts a string t = abcd. It is impossible to cut this band in such a way that there is at least one band repeating at least two times. So, the result of this game is -1.

If Ildar chooses the segment [3, 6], he cuts a string t = cabc. If he cuts t into three bands c, ab and c, the band c repeats two times and the number of different bands is 2. So, the result of this game is 2.

### Response

```cpp
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 410000;
struct st {
  int l, r, n, ans;
};
st qq[MAXN];
int n;
int tm;
int h[MAXN];
vector<int> eds[MAXN];
int go[MAXN];
int ans[MAXN];
int was[MAXN];
bool cmp(st a, st b) { return a.r != b.r ? a.r > b.r : a.l < b.l; }
struct node {
  int go[26];
  int suf, len;
};
node mem[MAXN];
int last;
int memcnt;
int newn() {
  memset(mem[memcnt].go, 255, sizeof(mem[memcnt].go));
  mem[memcnt].suf = -1;
  mem[memcnt].len = 0;
  return memcnt++;
}
void addc(int c) {
  int p = last;
  last = newn();
  mem[last].len = mem[p].len + 1;
  while (p != -1 && mem[p].go[c] == -1) mem[p].go[c] = last, p = mem[p].suf;
  if (p == -1) {
    mem[last].suf = 0;
    return;
  }
  int q = mem[p].go[c];
  if (mem[q].len == mem[p].len + 1) {
    mem[last].suf = q;
  } else {
    int cl = newn();
    mem[cl] = mem[q];
    mem[q].suf = cl;
    mem[last].suf = cl;
    mem[cl].len = mem[p].len + 1;
    while (p != -1 && mem[p].go[c] == q) mem[p].go[c] = cl, p = mem[p].suf;
  }
}
vector<int> qv[MAXN];
pair<int, int> rmq[MAXN * 4];
int gr[MAXN];
int pl[MAXN];
int pp[MAXN];
int tin[MAXN];
int tout[MAXN];
void build(int v, int tl, int tr) {
  rmq[v] = make_pair(-1, -1);
  if (tl + 1 == tr) return;
  int m = (tl + tr) >> 1;
  build(v * 2 + 1, tl, m);
  build(v * 2 + 2, m, tr);
}
void upd(int v, int tl, int tr, int x) {
  if (tl + 1 == tr) {
    if (qv[x].empty())
      rmq[v] = make_pair(-1, -1);
    else
      rmq[v] = make_pair(qq[qv[x].back()].l, qv[x].back());
    return;
  }
  int m = (tl + tr) >> 1;
  if (tin[x] < m)
    upd(v * 2 + 1, tl, m, x);
  else
    upd(v * 2 + 2, m, tr, x);
  rmq[v] = max(rmq[v * 2 + 1], rmq[v * 2 + 2]);
}
pair<int, int> get(int v, int tl, int tr, int x) {
  if (tr <= tin[x] || tout[x] <= tl) return make_pair(-1, -1);
  if (tin[x] <= tl && tr <= tout[x]) return rmq[v];
  int m = (tl + tr) >> 1;
  return max(get(v * 2 + 1, tl, m, x), get(v * 2 + 2, m, tr, x));
}
void buildrmq() { build(0, 0, n); }
void dfs(int v) {
  tin[v] = tm++;
  h[v] = 0;
  for (int u : eds[v]) {
    dfs(u);
    h[v] = max(h[v], h[u] + 1);
  }
  tout[v] = tm;
}
int cls = 1;
struct hld {
  vector<int> vv;
  vector<pair<int, int>> ed;
  vector<pair<int, int>> rmq;
  vector<pair<int, int>> rmqed;
  vector<int> nx;
  int p;
  void add(int v) { vv.push_back(v); }
  void init(int k) {
    for (int i = 0; i < (int)vv.size(); ++i) gr[vv[i]] = k, pl[vv[i]] = i;
    nx.resize(vv.size());
    for (int i = 0; i < (int)vv.size(); ++i) {
      for (int u : eds[vv[i]])
        if (i == (int)vv.size() - 1 || u != vv[i + 1])
          ed.push_back(make_pair(vv[i], u)), pp[u] = ed.size() - 1;
      nx[i] = ed.size();
    }
    rmq.resize(vv.size() * 4, make_pair(-1, -1));
    rmqed.resize(ed.size() * 4, make_pair(-1, -1));
  }
  void updv(int v, int tl, int tr, int x, pair<int, int> y) {
    if (tl + 1 == tr) {
      rmq[v] = y;
      return;
    }
    int m = (tl + tr) >> 1;
    if (x < m)
      updv(v * 2 + 1, tl, m, x, y);
    else
      updv(v * 2 + 2, m, tr, x, y);
    rmq[v] = max(rmq[v * 2 + 1], rmq[v * 2 + 2]);
  }
  void updv(int x, pair<int, int> y) { updv(0, 0, (int)vv.size(), x, y); }
  void upde(int v, int tl, int tr, int x, pair<int, int> y) {
    if (tl + 1 == tr) {
      rmqed[v] = y;
      return;
    }
    int m = (tl + tr) >> 1;
    if (x < m)
      upde(v * 2 + 1, tl, m, x, y);
    else
      upde(v * 2 + 2, m, tr, x, y);
    rmqed[v] = max(rmqed[v * 2 + 1], rmqed[v * 2 + 2]);
  }
  void upde(int x, pair<int, int> y) { upde(0, 0, (int)ed.size(), x, y); }
  pair<int, int> getv(int v, int tl, int tr, int l, int r) {
    if (r <= tl || tr <= l) return make_pair(-1, -1);
    if (l <= tl && tr <= r) return rmq[v];
    int m = (tl + tr) >> 1;
    return max(getv(v * 2 + 1, tl, m, l, r), getv(v * 2 + 2, m, tr, l, r));
  }
  pair<int, int> getv(int l, int r) { return getv(0, 0, (int)vv.size(), l, r); }
  pair<int, int> gete(int v, int tl, int tr, int l, int r) {
    if (r <= tl || tr <= l) return make_pair(-1, -1);
    if (l <= tl && tr <= r) return rmqed[v];
    int m = (tl + tr) >> 1;
    return max(gete(v * 2 + 1, tl, m, l, r), gete(v * 2 + 2, m, tr, l, r));
  }
  pair<int, int> gete(int x) { return gete(0, 0, (int)ed.size(), 0, nx[x]); }
};
hld gg[MAXN];
void updv(int v) {
  if (qv[v].empty())
    gg[gr[v]].updv(pl[v], make_pair(-1, -1));
  else
    gg[gr[v]].updv(pl[v],
                   make_pair(mem[v].len + qq[qv[v].back()].l, qv[v].back()));
}
void upde(int u, int v) {
  assert(gr[u] != gr[v]);
  pair<int, int> x = get(0, 0, n, v);
  x.first += mem[u].len;
  gg[gr[u]].upde(pp[v], x);
}
void dfs2(int v, int cnt) {
  was[v] = 1;
  gg[cnt].add(v);
  if (eds[v].empty()) {
    gg[cnt].init(cnt);
    return;
  }
  int mx = -1;
  for (int u : eds[v])
    if (mx == -1 || h[u] > h[mx]) mx = u;
  dfs2(mx, cnt);
  for (int u : eds[v])
    if (!was[u]) {
      gg[cls].p = v;
      dfs2(u, cls++);
    }
}
void addq(int x) {
  qv[go[qq[x].r]].push_back(x);
  upd(0, 0, n, go[qq[x].r]);
  x = go[qq[x].r];
  updv(x);
  while (gg[gr[x]].p != -1) upde(gg[gr[x]].p, gg[gr[x]].vv[0]), x = gg[gr[x]].p;
}
void delq(int x, int p) {
  qq[x].ans = p;
  assert(qv[go[qq[x].r]].back() == x);
  qv[go[qq[x].r]].pop_back();
  upd(0, 0, n, go[qq[x].r]);
  x = go[qq[x].r];
  updv(x);
  while (gg[gr[x]].p != -1) upde(gg[gr[x]].p, gg[gr[x]].vv[0]), x = gg[gr[x]].p;
}
void solve(int v, int p) {
  while (true) {
    pair<int, int> x = get(0, 0, n, v);
    if (x.first + mem[v].len >= p)
      delq(x.second, p);
    else
      break;
  }
  while (true) {
    pair<int, int> x = gg[gr[v]].getv(0, pl[v] + 1);
    if (x.first >= p)
      delq(x.second, p);
    else
      break;
  }
  while (true) {
    pair<int, int> x = gg[gr[v]].gete(pl[v]);
    if (x.first >= p)
      delq(x.second, p);
    else
      break;
  }
  if (gg[gr[v]].p != -1) solve(gg[gr[v]].p, p);
}
char s[MAXN];
string t;
int hv[30];
int nnx[MAXN];
int ppr[MAXN];
int nx[MAXN];
int pr[MAXN];
namespace aba {
void zf(const string &s, int *z) {
  z[0] = 0;
  int l = 0, r = 0;
  for (int i = 1; i < s.size(); ++i) {
    if (r > i)
      z[i] = min(r - i, z[i - l]);
    else
      z[i] = 0;
    while (i + z[i] < s.size() && s[i + z[i]] == s[z[i]]) ++z[i];
    if (i + z[i] > r) r = i + z[i], l = i;
  }
  z[s.size()] = 0;
}
const int MAXN = 210000;
vector<int> gl[MAXN];
vector<int> gr[MAXN];
int fl1[MAXN];
int fl2[MAXN];
int fl[MAXN];
int tm1;
vector<pair<int, int>> dtmp;
void add(int l, int len) {
  gl[l].push_back(l + len * 2);
  gr[l + 2 * len].push_back(l);
}
int z1[MAXN];
int z2[MAXN];
vector<pair<int, int>> run2(string s, int len, int fll) {
  string tmp = s.substr(0, len);
  reverse(tmp.begin(), tmp.end());
  zf(tmp, z1);
  tmp = s.substr(len) + s.substr(0, len);
  zf(tmp, z2);
  ++tm1;
  vector<pair<int, int>> ans;
  for (int i = 1; i < len; ++i) {
    if (fl[i] == tm1) continue;
    int go = z1[i];
    for (int j = 2 * i; j <= i + go; j += i) fl[j] = tm1;
  }
  for (int i = 0; i < len; ++i) {
    int k = len - i;
    if (fl[k] == tm1) continue;
    if (s[i] != s[len]) continue;
    int gl = z1[k];
    int gr = z2[s.size() - len + i];
    gl = min(gl, k - 1);
    for (int j = gl; j >= fll; --j) {
      if (j + gr < k) break;
      ans.emplace_back(i - j, k);
    }
  }
  return ans;
}
string s;
int n;
void run(int l, int r) {
  if (l + 1 == r) return;
  int mid = (l + r) >> 1;
  run(l, mid);
  run(mid, r);
  auto tt = s.substr(l, r - l);
  vector<pair<int, int>> tmp = run2(tt, mid - l, 0);
  for (auto p : tmp) add(p.first + l, p.second);
  reverse(tt.begin(), tt.end());
  tmp = run2(tt, r - mid, 1);
  int xx = r - l - 1;
  for (auto p : tmp) {
    int oth = xx - p.first - 2 * p.second + 1;
    add(l + oth, p.second);
  }
}
vector<tuple<int, long long, long long>> dd[MAXN];
const long long MOD = 1e9 + 7;
long long dp[MAXN];
void solve() {
  s = t;
  n = s.size();
  run(0, n);
  for (int i = 0; i < n; ++i) {
    sort(gl[i].begin(), gl[i].end());
    if (!gl[i].empty()) {
      nnx[i] = gl[i][0];
    } else {
      nnx[i] = n + 1;
    }
  }
  for (int i = 1; i <= n; ++i) {
    sort(gr[i].begin(), gr[i].end());
    if (!gr[i].empty()) {
      ppr[i] = gr[i].back();
    } else {
      ppr[i] = -1;
    }
  }
}
};  // namespace aba
int rrr[MAXN * 4];
void build2(int v, int tl, int tr) {
  if (tl + 1 == tr) {
    rrr[v] = nnx[tl];
    return;
  }
  int m = (tl + tr) >> 1;
  build2(v * 2 + 1, tl, m);
  build2(v * 2 + 2, m, tr);
  rrr[v] = min(rrr[v * 2 + 1], rrr[v * 2 + 2]);
}
int rmqget(int v, int tl, int tr, int l, int r) {
  if (r <= tl || tr <= l) return n + 1;
  if (l <= tl && tr <= r) {
    return rrr[v];
  }
  int m = (tl + tr) >> 1;
  return min(rmqget(v * 2 + 1, tl, m, l, r), rmqget(v * 2 + 2, m, tr, l, r));
}
int tmp[26];
int main() {
  ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
  int qqq;
  int q = 0;
  cin >> n;
  cin >> t;
  aba::solve();
  build2(0, 0, n);
  fill(tmp, tmp + 26, n);
  for (int i = t.size() - 1; i >= 0; --i) {
    nx[i] = tmp[t[i] - 'a'];
    tmp[t[i] - 'a'] = i;
  }
  fill(tmp, tmp + 26, -1);
  for (int i = 0; i < t.size(); ++i) {
    pr[i] = tmp[t[i] - 'a'];
    tmp[t[i] - 'a'] = i;
  }
  for (int i = 0; i < n; ++i) s[i] = t[i];
  cin >> qqq;
  for (int i = 0; i < qqq; ++i) {
    int l, r;
    cin >> l >> r;
    --l;
    if (r - l <= 26) {
      memset(hv, 0, sizeof(hv));
      int fl = 0;
      for (int i = l; i < r; ++i) {
        if (hv[t[i] - 'a']) fl = 1;
        hv[t[i] - 'a'] = 1;
      }
      if (!fl) {
        ans[i] = -1;
        continue;
      }
    }
    ans[i] = 4;
    if (nx[l] < r || pr[r - 1] >= l) ans[i] = 3;
    if (rmqget(0, 0, n, l, r) <= r) ans[i] = 3;
    if (nnx[l] <= r || ppr[r] >= l) ans[i] = 2;
    qq[q].l = l;
    qq[q].r = r;
    qq[q].n = i;
    ++q;
  }
  sort(qq, qq + q, cmp);
  last = newn();
  for (int i = 0; i < n; ++i) addc(s[i] - 'a');
  int now = 0;
  go[0] = now;
  for (int i = 0; i < n; ++i) now = mem[now].go[s[i] - 'a'], go[i + 1] = now;
  for (int i = 0; i < memcnt; ++i)
    if (mem[i].suf != -1) eds[mem[i].suf].push_back(i);
  int n2 = n;
  n = memcnt;
  dfs(0);
  buildrmq();
  gg[0].p = -1;
  dfs2(0, 0);
  now = 0;
  for (int i = n2 - 1; i >= 0; --i) {
    while (now < q && qq[now].r > i) addq(now++);
    solve(go[i], i);
  }
  for (int i = 0; i < q; ++i) {
    int go = qq[i].ans - qq[i].l;
    int l = qq[i].l;
    int r = qq[i].r;
    if (go * 2 >= r - l && (r - l) % (r - l - go) == 0)
      ans[qq[i].n] = 1;
    else if (go != 0)
      ans[qq[i].n] = 2;
  }
  for (int i = 0; i < qqq; ++i) cout << ans[i] << "\n";
  return 0;
}

```