import javax.swing.JOptionPane;
import java.util.Scanner;
public class revision {
	public int score;
	public String HD = "HD";
	public String DI = "DI";
	public String CR = "CR";
	public String PA = "PA";
	public String NN = "NN";

	public int getGrade() {
	System.out.println("enter your score.");
	Scanner percentage = new Scanner (System.in);
	return score = percentage.nextInt();

	}
	{

	if (score > 80 && score < 100)
		System.out.println(this.HD);
	else if (score >= 60 && score <= 79)
		System.out.println(this.DI);
	else if (score >= 50 && score <= 59)
		System.out.println(this.DI);
	else if (score >= 0 && score <= 49)
		System.out.println(this.NN);
	}
}