from scipy.sparse.csgraph import connected_components
from scipy.sparse import csr_matrix
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)]

    l = list(zip(*UV))
    d = [1] * len(UV)
    a = csr_matrix((d, (l[0], l[1])), (N, N))
    x = connected_components(a, return_labels=0)
    if x == 1:
        print('Bob')
    elif x == 2:
        num = [0] * N
        for u, v in UV:
            num[u] += 1
            num[v] += 1
        for n in num:
            if n not in (0, 2):
                print('Alice')
        print('Bob')
    else:
        print('Alice')


main()