import java.util.Scanner;

/*

 */
public class Main {
    Scanner in = new Scanner(System.in);
    public Main()
    {

        System.out.println("Enter your name");
        String x = in.nextLine();
        if(x.equals("Alice")){
            System.out.println("Hello Alice!");
        }else if(x.equals("Bob")){
            System.out.println("Hello Bob!");
        }else{System.out.println("Error");

        }
        
    }
}