#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  long long n;
  cin >> n;
  vector<long long> adj[n + 1];
  vector<pair<long long int, long long int> > edges;
  map<pair<long long int, long long int>, long long> m;
  for (int i = 0; i < n - 1; i++) {
    long long x, y;
    cin >> x >> y;
    adj[x].push_back(y);
    adj[y].push_back(x);
    edges.push_back(make_pair(x, y));
  }
  long long count = 0;
  for (int i = 0; i < n - 1; i++) {
    if (adj[edges[i].first].size() == 1 || adj[edges[i].second].size() == 1) {
      m[edges[i]] = count++;
    } else {
      m[edges[i]] = -1;
    }
  }
  for (int i = 0; i < n - 1; i++) {
    if (m[edges[i]] == -1) {
      m[edges[i]] = count++;
    }
  }
  for (int i = 0; i < n - 1; i++) {
    cout << m[edges[i]] << "\n";
  }
  return 0;
}
