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)


zero = one = 0
for i in range(n):
    
    l = len(g[i])
    if l > 2:
        print("Alice")
        exit(0)
    
    if l == 1:
        one += 1
    if l == 0:
        # print(i)
        zero += 1

# print(g,zero,one)
if one == 2 or zero == 1:
    print("Bob")
else:
    print("Alice")