#include <stdio.h>
main(){
	int results;
	printf("Pls input results：");
	scanf("%d",&results);
	switch(results/10){
		case 10:
		case 9:printf("成绩等级为A");break;
		case 8:printf("成绩等级为B"); break;
		case 7:printf("成绩等级为C"); break;
		case 6:printf("成绩等级为D"); break;
		case 5:
		case 4:
		case 3:
		case 2:
		case 1:
		case 0:printf("成绩等级为E"); break;
		default:printf("输入内容有误！");break; 
    }
}