from collections import Counter
import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

N = int(input())
edge = [0] * N
for _ in range(N-1):
    a, b = map(int, input().split())
    edge[a] += 1
    edge[b] += 1

c = Counter(edge)
if c[0] == 0:  # 木
    print("Bob")
elif c[0] == 1:
    if c[2] == N - 1:  # 輪っかと1つの島だと連接にできる
        print("Bob")
    else:
        print("Alice")
else:
    print("Alice")