#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long int n;
  cin >> n;
  long long int x, y, k = 0;
  vector<long long int> v[n + 50];
  long long int ans[n + 50];
  for (long long int i = 1; i <= n; i++) ans[i] = -111;
  for (long long int i = 1; i <= n - 1; i++) {
    cin >> x >> y;
    v[x].push_back(i);
    v[y].push_back(i);
  }
  for (long long int i = 0; i <= n - 1; i++) {
    if ((long long int)v[i].size() > 2) {
      for (auto j : v[i]) ans[j] = k++;
      break;
    }
  }
  for (long long int i = 1; i <= n; i++)
    if (ans[i] < 0) ans[i] = k++;
  for (long long int i = 1; i <= n - 1; i++) cout << ans[i] << endl;
}
