from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    N = int(input())
    UV = [tuple(map(int, input().split())) for _ in [0] * (N - 1)]

    num = [0] * N
    for u, v in UV:
        num[u] += 1
        num[v] += 1

    for n in num:
        if n not in (1, 2):
            print('Alice')
            return
    for n in num:
        if n not in (0, 2):
            print('Alice')
            return
    print('Bob')


main()