import java.util.Scanner;

class Main1{

    public static void main(String[] args) {
        System.out.println("What grade did you obtain? ");
        Scanner s = new Scanner(System.in);
        String grade = s.next();
        switch (grade)
        {
            case "A":
                System.out.println("You rock!");
                break;
            case "B":
                System.out.println("Could be better");
                break;
            case "C":
                System.out.println("You should practice more ");
                break;
            case "D":
                System.out.println("You failed! ");
                break;
            default:
                System.out.println("This ain't a grade! ");
                break;
        }
    }
}