n = int(input())

g = [[] for _ in range(n)]

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

for i in range(n):
    
    if len(g[i]) > 2:
        print("Alice")
        exit(0)

print("Bob")