#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=tf-8
#

"""
"""

from collections import defaultdict
from operator import itemgetter

import sys
input = sys.stdin.readline

def solve(n):
    n_edge = [0]*(n+1)
    edges = []
    for i in range(n-1):
        a, b = map(int,input().split())
        n_edge[a] += 1
        n_edge[b] += 1
        edges.append((a,b))
    if n <= 3:
        for j in range(0,n-1):
            print(j)
    else:
        x = list(enumerate(n_edge))[1:]
        y = list(filter(lambda i:i[1]==1,x))[:3]
        z = set(map(itemgetter(0),y))
        l = len(y)
        cnt1 = 0
        cnt2 = l
        for i in range(1,n):
            if cnt1 < l and (edges[i-1][0] in z or edges[i-1][1] in z):
                print(cnt1)
                cnt1+=1
            else:
                print(cnt2)
                cnt2+=1


def main():
    n = int(input())
    solve(n)


if __name__ == "__main__":
    main()