#include <bits/stdc++.h>
using namespace std;
string str;
struct HASH {
  static uint64_t splitmix64(const pair<int, int>& p) {
    static const uint64_t FIXED_RANDOM =
        chrono::steady_clock::now().time_since_epoch().count();
    long long x = p.first + FIXED_RANDOM, y = p.second + FIXED_RANDOM;
    x += 0x9e3779b97f4a7c15;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    y += 0x9e3779b97f4a7c15;
    y = (y ^ (y >> 30)) * 0xbf58476d1ce4e5b9;
    y = (y ^ (y >> 27)) * 0x94d049bb133111eb;
    return x ^ (x >> 31) ^ y ^ (y >> 31);
  }
  size_t operator()(const pair<int, int>& p) const {
    static const uint64_t FIXED_RANDOM =
        chrono::steady_clock::now().time_since_epoch().count();
    return splitmix64(p);
  }
};
void solve() {
  int m, n, a, b, c;
  cin >> n;
  vector<int> vec[n + 1];
  unordered_map<pair<int, int>, int, HASH> mp;
  vector<pair<int, int> > edges;
  for (int i = 0; i < (int)n - 1; i++) {
    cin >> a >> b;
    vec[a].push_back(b);
    vec[b].push_back(a);
    edges.push_back({min(a, b), max(a, b)});
  }
  c = 0;
  for (int i = 0; i < (int)n; i++) {
    if (vec[i].size() > 2) {
      a = i;
      b = vec[i][0];
      mp[{min(a, b), max(a, b)}] = 0;
      b = vec[i][1];
      mp[{min(a, b), max(a, b)}] = 1;
      b = vec[i][2];
      mp[{min(a, b), max(a, b)}] = 2;
      c = 3;
      break;
    }
  }
  for (int i = 0; i < (int)n - 1; i++) {
    if (mp.find(edges[i]) == mp.end()) {
      mp[edges[i]] = c++;
    }
  }
  for (int i = 0; i < (int)n - 1; i++) {
    cout << mp[edges[i]] << endl;
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  ;
  int tc = 1;
  while (tc--) {
    solve();
  }
  return 0;
}
