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

for i in S:
    if len(i) != 0:
        continue
    else:
        print('Alice')
        break
else:
    print('Bob')