import sys
import math
import heapq
import collections
def inputnum():
    return(int(input()))
def inputnums():
    return(map(int,input().split()))
def inputlist():
    return(list(map(int,input().split())))
def inputstring():
    return([x for x in input()])
def inputmatrixchar(rows):
    arr2d = [[j for j in input().strip()] for i in range(rows)] 
    return arr2d
def inputmatrixint(rows):
    arr2d = []
    for _ in range(rows):
        arr2d.append([int(i) for i in input().split()])
    return arr2d
    
n = inputnum()
a = [0]*(n+1)
us = []
vs = []
ans = [-1]*(n-1)
for i in range(n-1):
    u, v = inputnums()
    us.append(u)
    vs.append(v)
    a[u] += 1 
    a[v] += 1
for i in range(n-1):
    if a[vs[i]] == 1 or a[us[i]] == 1:
        vs[i] = -1
        us[i] = -1
cur = 0
for i in range(n-1):
    if vs[i] == -1 or us[i] == -1:
        ans[i] = cur
        cur += 1
for i in range(n-1):
    if ans[i] == -1:
        ans[i] = cur
        cur += 1
    print(ans[i])