#include <bits/stdc++.h>
using namespace std;
const int MAXN = 114514;
int N, M;
int T;
void YES() { printf("YES\n"); }
void NO() { printf("NO\n"); }
void read(int &a) { scanf("%d", &a); }
int out[MAXN];
int p[MAXN];
int answer[MAXN];
void work() {
  scanf("%d", &N);
  int f, t;
  for (int i = 1; i <= N - 1; ++i) {
    scanf("%d%d", &f, &t);
    out[f]++;
    out[t]++;
    p[f] = p[t] = i;
  }
  if (N == 2) {
    printf("%d", 0);
    return;
  }
  if (N == 3) {
    printf("%d\n%d", 0, 1);
    return;
  }
  int sum = 0;
  for (int i = 1; i <= N; ++i) {
    if (out[i] == 1) {
      sum++;
    }
  }
  if (sum == 2) {
    for (int i = 0; i <= N - 2; ++i) {
      printf("%d\n", i);
    }
    return;
  }
  int cnt = 0;
  for (int i = 1; i <= N; ++i) {
    if (out[i] == 1) {
      answer[p[i]] = ++cnt;
      if (cnt == 3) {
        break;
      }
    }
  }
  for (int i = 1; i <= N - 1; ++i) {
    if (answer[i]) {
      printf("%d\n", answer[i] - 1);
    } else {
      ++cnt;
      printf("%d\n", cnt - 1);
    }
  }
}
int main() {
  work();
  return 0;
}
