#include <bits/stdc++.h>
using namespace std;
int n, l[100009];
vector<int> v[100009];
pair<int, int> p[100009];
int main() {
  cin.tie(0);
  cout.tie(0);
  ios::sync_with_stdio(0);
  ios_base::sync_with_stdio(0);
  cin >> n;
  for (int i = 0, x, y; i < n - 1; i++) {
    cin >> x >> y;
    x--;
    y--;
    v[x].push_back(y);
    v[y].push_back(x);
    p[i] = {x, y};
  }
  for (int i = 0; i < n; i++) {
    if (v[i].size() == 1) l[i] = 1;
  }
  for (int i = 0, x, y, j = 0, k = n - 2; i < n - 1; i++) {
    x = p[i].first;
    y = p[i].second;
    if (l[x] || l[y]) {
      cout << j << "\n";
      j++;
    } else {
      cout << k << "\n";
      k--;
    }
  }
}
