1038
#include<stdio.h>
int main() {
int score;
scanf("%d",&score);
switch(score/10){
case 10:printf("A");break;
case 9:printf("A");break;
case 8:printf("B");break;
case 7:printf("C");break;
case 6:printf("D");break;
default:printf("E");break;
}
return 0;
}
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