#include <bits/stdc++.h>
using namespace std;
vector<int> vec[100001];
map<pair<int, int>, int> mp;
int val[100001];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  int u, v;
  for (int i = 0; i < n - 1; i++) {
    cin >> u >> v;
    vec[u].push_back(v);
    vec[v].push_back(u);
    mp[{min(u, v), max(u, v)}] = i;
  }
  int cnt = 1;
  for (int i = 1; i <= n; i++) {
    if (vec[i].size() >= 3) {
      val[mp[{min(i, vec[i][0]), max(i, vec[i][0])}]] = 1;
      val[mp[{min(i, vec[i][1]), max(i, vec[i][1])}]] = 2;
      val[mp[{min(i, vec[i][2]), max(i, vec[i][2])}]] = 3;
      cnt = 4;
      break;
    }
  }
  for (int i = 0; i < n - 1; i++) {
    if (val[i] == 0) {
      val[i] = cnt;
      cnt++;
    }
  }
  for (int i = 0; i < n - 1; i++) cout << val[i] - 1 << "\n";
  return 0;
}
