#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;
}

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