import java.util.*;
import java.io.*;
import java.math.*;
 
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int[] map = new int[N]; 
        for(int i = 0; i < N-1; i++){
            map[sc.nextInt()]++;
            map[sc.nextInt()]++;
        }
        int cnt1 = 0;
        int cnt0 = 0;
        for(int i = 0; i < N; i++){
            if(map[i] == 1){
                cnt1++;
            }
            if(map[i] == 0){
                cnt0++;
            }
        }
        if(cnt0 == 0 || (cnt0 == 1 && cnt1 == 0)){
            System.out.println("Bob");
        }else{
            System.out.println("Alice");
        }
    }
}