#include <stdio.h>
int main(){
int grade,a,b,c,d,e;//每个分数段计数器
a=b=c=d=e=0; //计数器 初始值 必须 从 0
while (scanf("%d",&grade)!=0) { //输入非整数 结束循环
switch(grade/10){
case 10: printf("A\n");a=a+1;break;
case 9: printf("A\n");a=a+1;break;
case 8: printf("B\n");b=b+1;break;
case 7: printf("C\n");c=c+1;break;
case 6: printf("D\n");d=d+1;break;
default: printf("E\n");e=e+1;break;
}
}//循环结束
printf("a=%d\n",a);
printf("b=%d\n",b);
printf("c=%d\n",c);
printf("d=%d\n",d);
printf("e=%d\n",e);
return 0;
}