import java.util.Scanner;
 
public class ScoreLevel2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
 
        System.out.print("請輸入分數: "); 
        int score = scanner.nextInt();
        int level = (int) score/10; 
 
        switch(level) { 
            case 10: 
            case 9: 
                System.out.println("得A"); 
                break; 
            case 8: 
                System.out.println("得B"); 
                break; 
            case 7: 
                System.out.println("得C"); 
                break; 
            case 6: 
                System.out.println("得D"); 
                break; 
            default: 
                System.out.println("得E(不及格)"); 
        }
    }
}