#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1000005;
const int SQRTN = 1003;
const int LOGN = 22;
const double PI = acos(-1);
const int INF = 1e9;
int MOD = 1000000007;
const int FMOD = 998244353;
const double eps = 1e-9;
long long gcd(long long a, long long b) {
  if (a == 0) return (b);
  return (gcd(b % a, a));
}
long long lcm(long long a, long long b) { return (a / gcd(a, b) * b); }
void solve() {
  long long n;
  cin >> n;
  vector<long long> mp[n + 5];
  long long c1, c2;
  long long ans[n + 5];
  memset(ans, -1, sizeof(ans));
  for (long long i = 1; i <= n - 1; i++) {
    cin >> c1 >> c2;
    mp[c1].push_back(i);
    mp[c2].push_back(i);
  }
  int cur = 0;
  for (long long i = 1; i <= n; i++) {
    if (mp[i].size() == 1) ans[mp[i][0]] = cur++;
  }
  for (long long i = 1; i < n; i++) {
    if (ans[i] == -1) ans[i] = cur++;
    cout << ans[i] << endl;
  }
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long t = 1;
  while (t--) {
    solve();
  }
  return (0);
}
