//Method two while loop,else if
#include<iostream>
void pr(int n);
using namespace std;
int main(){
int n,i=0; //The value of i should be set to0
cin>>n;
while(n--){ //While(n--) execute steps:
//1.First take the value of n to determine whether it is0, if yes, jump out of the loop
//2.If not, execute n=n-1
//3. Then execute a while loop
int num;
cin>>num;
pr(num);
if(i!=n) cout<<" "; //The value of n is0
}
return 0;
}
void pr(int n){
if(n>=90) cout<<"A";
else if(n>=80) cout<<"B"; //else ifConditional sentences can eliminate the previous situation
else if(n>=70) cout<<"C";
else if(n>=60) cout<<"D";
else cout<<"E";
}