using System;
using System.Linq;
using System.Collections.Generic;

public static class Program{
    public static void Main() {
        int n=int.Parse(Console.ReadLine());
        var graph=Enumerable.Range(0,n)
            .Select(_=>new List<int>()).ToArray();
        for(int i=0;i<n-1;i++){
            int[]uv=Console.ReadLine().Split().Select(int.Parse).ToArray();
            graph[uv[0]].Add(uv[1]);
            graph[uv[1]].Add(uv[0]);
        }
        bool[]ckd=new bool[n];
        var que=new Queue<int>();
        int counter=0;
        for(int i=0;i<n;i++){
            if(ckd[i])continue;
            que.Enqueue(i);
            while(0<que.Count){
                int x=que.Dequeue();
                ckd[x]=true;
                foreach(int y in graph[x]){
                    if(!ckd[y])que.Enqueue(y);
                }
            }
        }
        if(counter!=2) {
            Console.WriteLine(counter==1?"Bob":"Alice");
            return;
        }
        for(int i=0;i<n;i++){
            if(graph[i].Count!=0&&graph[i].Count!=2){
                Console.WriteLine("Alice");
                return;
            }
        }
        Console.WriteLine("Bob");
    }
}