#include<iostream>
using namespace std;
int main()
{

    int num;
    cin >> num;
    cout << "Letter Grade:" ;

    if (num<40){
        cout << "Failed";
    } else if (num >=40 && num <45){
        cout << " C- " ;

    } else if (num >=45 && num <50){
        cout << "C";


    } else if (num >=50 && num <55){
        cout << "C+" ;

    } else if (num >=55 && num <60){
        cout << "B-" ;

    } else if (num >=60 && num <65){
        cout << "B" ;
    } else if (num >=65 && num <70){
        cout << "B+" ;
    } else if (num >=70 && num <75){
        cout << "A-" ;
    } else if (num >=75 && num <80){
        cout << "A" ;
    } else if (num >=80 && num <=100){
        cout << "A+" ;
    }
}