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