import java.util.Scanner;
/**
 * Created by iyasuwatts on 10/17/17.
 */
public class Main {

    public static void main( ){
        Scanner user_input = new Scanner( System.in );
        
        System.out.print("What is your name? ");
        String name = user_input.next();
        
        if(name.equals("Bob") || name.equals("Alice")) {
            System.out.println("Hello there " + name);
        } else{
            System.out.println("Im sorry I don\'t know you");   
    }
    
}
}