#include<stdio.h>int main() {int grade; scanf("%d",&grade)

;printf("your grade:")

;switch((int)grade/10) {case 10:case 9:printf("A

")

;break;case 8:printf("B

");break;case 7:printf("C

");break;case 6:printf("D

");break;default:printf("E

");break;}return 0;}