#include <stdio.h>
int main()
{
       char grade;
    scanf("%c\n",&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("error!\n");
    }
 return 0;
}