#include <stdio.h>
void main()
{float score;
 printf("Enter score:");
 scanf("%f",&score);
 if(score<=100 && score>=90) printf("A\n");
 else if(score>=80) printf("B\n");
 else if(score>=70) printf("C\n");
 else if(score>=60) printf("D\n");
 else  printf("E\n");
 }