#include<bits/stdc++.h> using namespace std； int main(){ int grade; cin>>grade; switch(grade) { case 5:cout<<"A"<<endl;break; case 4:cout<<"B"<<endl;break; case 3:cout<<"C"<< endl;break; case 2:cout<<"D"<<endl;break; case 1:cout<<"E"<<endl; } return 0; }