N = int(input())
a = [0] * N
for _ in range(N-1):
    u, v = map(int, input().split())
    a[u] += 1
    a[v] += 1
if a.count(0) >= 2:
    print("Alice")
elif a.count(0) == 1 and a.count(1) >= 1:
    print("Alice")
else:
    print("Bob")