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();
        if(N == 2){
            System.out.println("Alice");
            return;
        }
        int[] map = new int[N]; 
        for(int i = 0; i < N-1; i++){
            map[sc.nextInt()]++;
            map[sc.nextInt()]++;
        }
        for(int i = 0; i < N; i++){
            if(map[i] == 0){
                System.out.println("Alice");
                return;
            }
        }
        System.out.println("Bob");
    }
}