# coding: utf-8
# Your code here!
import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline
read = sys.stdin.read


n = int(input())
res = [0]*n
for _ in range(n-1):
    a,b = [int(i) for i in readline().split()]
    res[a] += 1
    res[b] += 1

c = res.count(0)    
d = res.count(1)

if c >= 2:
    print("Alice")
elif c == 0:
    print("Bob")
else:
    if d == 0: 
        print("Alice")
    else:
        print("Bob")