HDOJ 2004

#include"stdio.h"

int main(void){
	int i;
	
	while(scanf("%d", &i) != EOF){		
		if(i < 0 || i > 100){
			printf("Score is error!\n");
		}
		else{
			i = i / 10;
			
			switch(i){
				case 10:
				case 9:
					printf("A\n");break;
				case 8:
					printf("B\n");break;
				case 7:		
					printf("C\n");break;
				case 6:
					printf("D\n");break;
				default:
					printf("E\n");break;			
			}		
		}
		
	}
	
	return 0;