#import pysnooper
#import numpy
#import os,re,sys,operator
#from collections import Counter,deque
#from operator import itemgetter,mul
#from itertools import accumulate,combinations,groupby,combinations_with_replacement,permutations
from sys import stdin,setrecursionlimit
#from bisect import bisect_left,bisect_right
#from copy import deepcopy
#import heapq
#import math
#import string
#from time import time
#from functools import lru_cache,reduce
#from math import factorial,hypot
#import sys
#from fractions import gcd
setrecursionlimit(10**6)
input=stdin.readline

class Union_find:
    
    def __init__(self,n):
        self.n=n
        self.root=[-1]*(n+1)
        self.rank=[0]*(n+1)
    
    def find_root(self,x):
    
        if self.root[x]<0: return x
        else:
            self.root[x]=self.find_root(self.root[x])
            return self.root[x]
    
    def unite(self,x,y):
    
        x,y=self.find_root(x),self.find_root(y)
    
        if x==y: return 
        elif self.rank[x]>self.rank[y]:
            self.root[x]+=self.root[y]
            self.root[y]=x
        else:
            self.root[y]+=self.root[x]
            self.root[x]=y
            if self.rank[x]==self.rank[y]: self.rank[y]+=1
    
    def same(self,x,y):
        return self.find_root(x)==self.find_root(y)
    
    def count(self,x):
        return -self.root[self.find_root(x)]

n=int(input().rstrip())
g=Union_find(n-1)
e=[0]*n
for _ in range(n-1):
    u,v=map(int,input().split())
    g.unite(u,v)
    e[u]+=1
    e[v]+=1

r=len(set(g.find_root(i) for i in range(n)))
if r==1:
    print("Bob")
elif r>=3:
    print("Alice")
else:
    print("Alice" if 1 in e else "Bob")