#include<stdio.h>
int main()
{
char grade,score;
int range;
printf("input grade:\n");
scanf("%c",&grade);
if(grade='A')
printf("score>=90\n");
if(grade='B')
printf("80<=score<90\n");
if(grade='C')
printf("70<=score<80\n");
if(grade='D')
printf("60<=score<70\n");
if(grade='E')
printf("score<=60\n");
return 0;
}