#include <stdio.h>

int main()
{
    char grade;
	scanf("%c",&grade);
	printf("Your score:");
	switch(grade)
	{
			case'A':printf("85~100\n");break;
			case'B':printf("70~84\n");break;
			case'C':printf("60~69\n");break;
			case'D':printf("<60\n");break;
		default:printf("enter data error!\n");
	}
return 0;
}