#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; }