


def main():
    n = int(input())
    lst = [0] * (n+1)
    s = []
    for i in range(n-1):
        a, b = map(int, input().split())
        s.append((a,b))
        lst[a]+=1
        lst[b] +=1

    sol = []
    left = 0
    right = n-2
    for a, b in s:
        if lst[a] == 1 or lst[b] == 1:
            print(left)
            left +=1
        else:
            print(right)
            right -=1

if __name__ == "__main__":
    main()
