n=int(input())
A=[]
B=[0]*(n-1)
G=[[] for i in range(n)]
GG=[[0]*2 for i in range(n-1)]
for i in range(n-1):
    a,b=map(int,input().split())
    c=a
    a=min(b,c)
    b=max(b,c)
    GG[i]=[a,b]
    G[a-1].append(b-1)
    G[b-1].append(a-1)
    A.append(a*10**6+b)
D=dict(zip(A,B))
a=10**6
b=10**6
c=10**6
for i in range(n):
    if len(G[i])>=3:
        a=i
        break
if a==10**6:
    for i in range(n-1):
        print(i)
else:
    B=[]
    for i in range(3):
        D[min(a+1,G[a][i]+1)*10**6+max(a+1,G[a][i]+1)]=i
        B.append(min(a+1,G[a][i]+1)*10**6+max(a+1,G[a][i]+1))
    f=3
    x=3
    for i in range(n-1):
        if GG[i][0]*10**6+GG[i][1] not in B:
            print(x)
            x=x+1
        else:
            print(D[GG[i][0]*10**6+GG[i][1]])
