from sys import stdin
"""
import functools

mod = 998244353
def ncr(n,r):
    r=min(r,n-r)
    a=functools.reduce(lambda x,y: (x*y), range(n,n-r,-1),1)
    b=functools.reduce(lambda x,y: (x*y), range(1,r+1),1)
    return a//b

"""
def func(arr, l, r, x):
    while(l<r):
        mid = (l+r)//2
        if arr[mid]+x > 0:
            r = mid
        else:
            l = mid+1
    return l

d = {}
i = 0
n = int(stdin.readline())
for _ in range(n-1):
    #x = int(stdin.readline())
    u, v = map(int, stdin.readline().split())
    #arr = list(map(int,stdin.readline().split())
    if u in d:
        d[u][0] += 1
        d[u][1].append(i)
    else:
        d[u] = [1, [i]]
        
    if v in d:
        d[v][0] += 1
        d[v][1].append(i)
    else:
        d[v] = [1, [i]]
    
    i += 1
ans = [-1]*(n-1)
val = 0
for ele in d:
    if d[ele][0]>=3:
        for item in d[ele][1]:
            if ans[item] == -1:
                ans[item] = val
                val += 1

for i in range(n-1):
    if ans[i] == -1:
        print(val)
        val += 1
    else:
        print(ans[i])
