n = int(input())
dicts = {i:[] for i in range(n)}
lists = [-1 for i in range(n)]

for i in range(n - 1):
    te, mp = map(int, input().split())
    dicts[te] += [mp]
    dicts[mp] += [te]

for i in range(n):
    if dicts[i]:
        tmp = min(dicts[i])
        if tmp < i:
            lists[i] = tmp

# [print(i) for i in lists]
        
ans = len(list(filter(lambda x: x==-1, lists)))
if ans == 1:
    print('Bob')
elif ans >= 3:
    print('Alice')
else:
    a = len(list(filter(lambda x: len(x)==2, dicts.values())))
    if a + 1 == len(dicts):
        print('Bob')
    else:
        print('Alice')