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];
        Action<int>dfs=null;
        dfs=x=>{
            ckd[x]=true;
            foreach(int y in graph[x]){
                if(!ckd[y])dfs(y);
            }
        };
        int counter=0;
        for(int i=0;i<n;i++){
            if(!ckd[i]){
                counter++;
                dfs(i);
            }
        }
        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");
    }
}