#include

using namespace std;

int main(){

int x; cin >> x; if(x >= 95 && x <= 100){ cout << "A+" << endl; } else if(x >=85 && x <95){ cout << "A" << endl; } else if(x >=75 && x <85){ cout << "B" << endl; } else if(x >=60 && x <75){ cout << "C" << endl; } else{ cout << "D" << endl; }

gfdgfdh

return 0; }