import sys
readline = sys.stdin.readline
    
N = int(readline())
D = [0] * N
for i in range(N - 1):
    w, v = map(int, readline().split())
    D[w] += 1
    D[v] += 1
    
zero = 0
for i in range(N):
    if D[i] == 0:
        zero += 1
if (zero == 1 and len(set(D)) == 2) or not zero:
    print("Bob")
else:
    print("Alice")