#include <bits/stdc++.h>
using namespace std;
int n, a[300005];
int main() {
  ios::sync_with_stdio(false);
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  vector<pair<int, int>> ans;
  for (int i = 1; i <= n;) {
    set<int> s;
    s.insert(a[i]);
    int sz = s.size();
    int j = i + 1;
    while (j <= n) {
      s.insert(a[j]);
      if (s.size() == sz) {
        ans.push_back(make_pair(i, j));
        j++;
        break;
      } else {
        sz++;
      }
      j++;
    }
    i = j;
  }
  if (ans.size() == 0) {
    cout << -1 << endl;
  } else {
    cout << ans.size() << endl;
    for (int i = 0; i < ans.size(); i++) {
      if (i == ans.size() - 1 && ans[i].second != n) {
        cout << ans[i].first << " " << n << endl;
        break;
      }
      cout << ans[i].first << " " << ans[i].second << endl;
    }
  }
}

### Prompt

Your task is to create a Cpp solution to the following problem:

The array a with n integers is given. Let's call the sequence of one or more consecutive elements in a segment. Also let's call the segment k-good if it contains no more than k different values.

Find any longest k-good segment.

As the input/output can reach huge size it is recommended to use fast input/output methods: for example, prefer to use scanf/printf instead of cin/cout in C++, prefer to use BufferedReader/PrintWriter instead of Scanner/System.out in Java.

Input

The first line contains two integers n, k (1 ≤ k ≤ n ≤ 5·105) — the number of elements in a and the parameter k.

The second line contains n integers ai (0 ≤ ai ≤ 106) — the elements of the array a.

Output

Print two integers l, r (1 ≤ l ≤ r ≤ n) — the index of the left and the index of the right ends of some k-good longest segment. If there are several longest segments you can print any of them. The elements in a are numbered from 1 to n from left to right.

Examples

Input

5 5
1 2 3 4 5


Output

1 5


Input

9 3
6 5 1 2 3 2 1 4 5


Output

3 7


Input

3 1
1 2 3


Output

1 1

### Response

```cpp
#include <bits/stdc++.h>
using namespace std;
int n, a[300005];
int main() {
  ios::sync_with_stdio(false);
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  vector<pair<int, int>> ans;
  for (int i = 1; i <= n;) {
    set<int> s;
    s.insert(a[i]);
    int sz = s.size();
    int j = i + 1;
    while (j <= n) {
      s.insert(a[j]);
      if (s.size() == sz) {
        ans.push_back(make_pair(i, j));
        j++;
        break;
      } else {
        sz++;
      }
      j++;
    }
    i = j;
  }
  if (ans.size() == 0) {
    cout << -1 << endl;
  } else {
    cout << ans.size() << endl;
    for (int i = 0; i < ans.size(); i++) {
      if (i == ans.size() - 1 && ans[i].second != n) {
        cout << ans[i].first << " " << n << endl;
        break;
      }
      cout << ans[i].first << " " << ans[i].second << endl;
    }
  }
}

```