#include<iostream> #include<cstdio> 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 ; default:cout<<"E"<< endl; } return 0; }