#include<stdio.h> int main() { int a,b; scanf("%d",&a);

while(a--){ scanf("%d",&b); int c=b/10; switch(c){ case 9: case 10: printf("A\n");break; case 8: printf("B\n");break; case 7: printf("C\n");break; case 6: printf("D\n");break; default: printf("E\n");break;} } return 0; }