n=int(input())
edge=[[] for i in range(n+1)]
matrix=[]
for i in range(n-1):
    u,v=list(map(int,input().split()))
    edge[u].append(v)
    edge[v].append(u)
    matrix.append([u,v])
lis=[]
for i in range(1,n+1):
    lis.append(len(edge[i]))
a=max(lis)
if a<=2:
    for i in range(n-1):
        print(i)
else:
    b=lis.index(a)
    arr=[]
    for i in range(3):
        arr.append(edge[b+1][i])
    ans=[-1]*(n-1)
    p=0
    for i in range(n-1):
        if (matrix[i]==[b+1,arr[0]] or matrix[i]==[arr[0],b+1]) or (matrix[i]==[b+1,arr[1]] or matrix[i]==[arr[1],b+1]) or (matrix[i]==[b+1,arr[2]] or matrix[i]==[arr[2],b+1]):
            ans[i]=p
            p+=1
    p=3
    for i in range(n-1):
        if ans[i]==-1:
            ans[i]=p
            p+=1
    for i in range(n-1):
        print(ans[i])