#include<stdio.h>
#include<math.h>
#include<string.h>
int main()
{
int score;
scanf("%d",&score);
int s=score/10;
switch(s)
{
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;
}
}
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