#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  vector<int> vis(n, 0);
  vector<int> deg(n, 0);
  vector<pair<int, int>> g;
  int mx = 0;
  for (int i = 0; i < n - 1; ++i) {
    int u, v;
    cin >> u >> v;
    --u;
    --v;
    g.push_back({u, v});
    deg[u]++;
    deg[v]++;
    mx = max(mx, deg[u]);
    mx = max(mx, deg[v]);
  }
  if (mx < 3) {
    for (int i = 0; i < n - 1; ++i) {
      cout << i << endl;
    }
    return 0;
  }
  int id;
  for (int i = 0; i < n; ++i) {
    if (deg[i] > 2) {
      id = i;
      break;
    }
  }
  int ptr = 2;
  int x = n - 2;
  for (int i = 0; i < n - 1; ++i) {
    if ((g[i].first == id || g[i].second == id) && ptr >= 0) {
      cout << ptr << endl;
      ptr--;
    } else {
      cout << x << endl;
      x--;
    }
  }
  return 0;
}
