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package itheima;

import java.util.Scanner;

public class ceshi1 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        String grade=sc.nextLine();
        switch(grade) {
            case"a":
                System.out.println("nidechengjiyouxiu");
                break;
            case"b":
                System.out.println("nidiyouxiu");
                break;
            case"c":
                System.out.println("youxiu");
                break;
            default:
                System.out.println("default");

        }

    }
}