第一道题

#include<bits/stdc++.h>
using namespace std;

int main(){
    int x;
    cin>>x;
    switch(x/10){
    case 9:cout<<"A";
    break;
    case 8:cout<<"B";
    break;
    case 7:cout<<"C";
    break;
    case 6:cout<<"D";
    break;
    default:cout<<"E";
    }
return 0;
}