#include "stdio.h"
int main()
{
int a,n;
scanf("%d",&n);
while(n--)
{ scanf("%d",&a);
if(a>=90&&a<=100) printf("A\n");
else if(a>=80&&a<=89) printf("B\n");
else if(a>=70&&a<=79) printf("C\n");
else if(a>=60&&a<=69) printf("D\n");
else if(a>=0&&a<=59) printf("E\n");
}
return 0;
}