#include <bits/stdc++.h>
using namespace std;
const long long M = 1e9 + 7;
long long dx[] = {1, -1, 0, 0, 1, 1, -1, -1};
long long dy[] = {0, 0, 1, -1, 1, -1, 1, -1};
long long expo(long long x, long long y) {
  long long res = 1;
  x = x % M;
  while (y > 0) {
    if (y & 1) res = (1ll * res * x) % M;
    y = y >> 1;
    x = (1ll * x * x) % M;
  }
  return res;
}
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  long long t = 1;
  while (t--) {
    long long n, k;
    cin >> n;
    long long hash[n], cnt = 0;
    memset(hash, -1, sizeof hash);
    vector<pair<long long, long long>> v;
    map<long long, long long> mp;
    for (long long i = 0; i < n - 1; i++) {
      long long x, y;
      cin >> x >> y;
      mp[x]++;
      mp[y]++;
      v.push_back({x, y});
    }
    for (long long i = 0; i < v.size(); i++) {
      if (mp[v[i].first] == 1 || mp[v[i].second] == 1) {
        hash[i] = cnt++;
      }
    }
    for (long long i = 0; i < n - 1; i++) {
      if (hash[i] == -1) hash[i] = cnt++;
    }
    for (long long i = 0; i < n - 1; i++) {
      cout << hash[i] << "\n";
    }
  }
  return 0;
}
