n = int(input())
S = [[]for i in range(n)]
for i in range(n-1):
    u,v = list(map(int, input().split()))
    S[u].append(v)
    S[v].append(u)

cnt=set()
for i in S:
    cnt.add(len(i))

if 0 in cnt:
    print('Alice')
else:
    print('Bob')