from sys import stdin


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

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

    zero = cnt.count(0)
    if not zero:
        print('Bob')
    elif zero == 1 and cnt.count(2) == N - 1:
        print('Bob')
    else:
        print('Alice')


main()