#include <bits/stdc++.h>
using namespace std;
const int N = 5e3 + 5;
vector<int> adj[N];
int n, m, eu[N], ev[N], ew[N], a[N], b[N], g[N];
bool dfs1(int u, int t, int w, int p = -1) {
  if (u == t) {
    return 1;
  }
  for (int e : adj[u]) {
    int v = eu[e] ^ ev[e] ^ u;
    if (v == p) {
      continue;
    }
    if (dfs1(v, t, w, u)) {
      ew[e] = max(ew[e], w);
      return 1;
    }
  }
  return 0;
}
int dfs2(int u, int t, int p = -1) {
  if (u == t) {
    return 1e9;
  }
  for (int e : adj[u]) {
    int v = eu[e] ^ ev[e] ^ u;
    if (v == p) {
      continue;
    }
    int a = dfs2(v, t, u);
    if (~a) {
      return min(a, ew[e]);
    }
  }
  return -1;
}
int main() {
  cin >> n;
  for (int i = 1; i < n; i++) {
    cin >> eu[i] >> ev[i], eu[i]--, ev[i]--;
    adj[eu[i]].push_back(i);
    adj[ev[i]].push_back(i);
  }
  fill(ew + 1, ew + n, 1);
  cin >> m;
  for (int i = 0; i < m; i++) {
    cin >> a[i] >> b[i] >> g[i], --a[i], --b[i];
    dfs1(a[i], b[i], g[i]);
  }
  for (int i = 0; i < m; i++) {
    if (dfs2(a[i], b[i]) ^ g[i]) {
      cout << "-1";
      exit(0);
    }
  }
  for (int i = 1; i < n; i++) {
    cout << ew[i] << "\n";
  }
  return 0;
}

### Prompt

In Cpp, your task is to solve the following problem:

There are n railway stations in Berland. They are connected to each other by n-1 railway sections. The railway network is connected, i.e. can be represented as an undirected tree.

You have a map of that network, so for each railway section you know which stations it connects.

Each of the n-1 sections has some integer value of the scenery beauty. However, these values are not marked on the map and you don't know them. All these values are from 1 to 10^6 inclusive.

You asked m passengers some questions: the j-th one told you three values:

  * his departure station a_j; 
  * his arrival station b_j; 
  * minimum scenery beauty along the path from a_j to b_j (the train is moving along the shortest path from a_j to b_j). 



You are planning to update the map and set some value f_i on each railway section — the scenery beauty. The passengers' answers should be consistent with these values.

Print any valid set of values f_1, f_2, ..., f_{n-1}, which the passengers' answer is consistent with or report that it doesn't exist.

Input

The first line contains a single integer n (2 ≤ n ≤ 5000) — the number of railway stations in Berland.

The next n-1 lines contain descriptions of the railway sections: the i-th section description is two integers x_i and y_i (1 ≤ x_i, y_i ≤ n, x_i ≠ y_i), where x_i and y_i are the indices of the stations which are connected by the i-th railway section. All the railway sections are bidirected. Each station can be reached from any other station by the railway.

The next line contains a single integer m (1 ≤ m ≤ 5000) — the number of passengers which were asked questions. Then m lines follow, the j-th line contains three integers a_j, b_j and g_j (1 ≤ a_j, b_j ≤ n; a_j ≠ b_j; 1 ≤ g_j ≤ 10^6) — the departure station, the arrival station and the minimum scenery beauty along his path.

Output

If there is no answer then print a single integer -1.

Otherwise, print n-1 integers f_1, f_2, ..., f_{n-1} (1 ≤ f_i ≤ 10^6), where f_i is some valid scenery beauty along the i-th railway section.

If there are multiple answers, you can print any of them.

Examples

Input


4
1 2
3 2
3 4
2
1 2 5
1 3 3


Output


5 3 5


Input


6
1 2
1 6
3 1
1 5
4 1
4
6 1 3
3 4 1
6 5 2
1 2 5


Output


5 3 1 2 1 


Input


6
1 2
1 6
3 1
1 5
4 1
4
6 1 1
3 4 3
6 5 3
1 2 4


Output


-1

### Response

```cpp
#include <bits/stdc++.h>
using namespace std;
const int N = 5e3 + 5;
vector<int> adj[N];
int n, m, eu[N], ev[N], ew[N], a[N], b[N], g[N];
bool dfs1(int u, int t, int w, int p = -1) {
  if (u == t) {
    return 1;
  }
  for (int e : adj[u]) {
    int v = eu[e] ^ ev[e] ^ u;
    if (v == p) {
      continue;
    }
    if (dfs1(v, t, w, u)) {
      ew[e] = max(ew[e], w);
      return 1;
    }
  }
  return 0;
}
int dfs2(int u, int t, int p = -1) {
  if (u == t) {
    return 1e9;
  }
  for (int e : adj[u]) {
    int v = eu[e] ^ ev[e] ^ u;
    if (v == p) {
      continue;
    }
    int a = dfs2(v, t, u);
    if (~a) {
      return min(a, ew[e]);
    }
  }
  return -1;
}
int main() {
  cin >> n;
  for (int i = 1; i < n; i++) {
    cin >> eu[i] >> ev[i], eu[i]--, ev[i]--;
    adj[eu[i]].push_back(i);
    adj[ev[i]].push_back(i);
  }
  fill(ew + 1, ew + n, 1);
  cin >> m;
  for (int i = 0; i < m; i++) {
    cin >> a[i] >> b[i] >> g[i], --a[i], --b[i];
    dfs1(a[i], b[i], g[i]);
  }
  for (int i = 0; i < m; i++) {
    if (dfs2(a[i], b[i]) ^ g[i]) {
      cout << "-1";
      exit(0);
    }
  }
  for (int i = 1; i < n; i++) {
    cout << ew[i] << "\n";
  }
  return 0;
}

```