#include <iostream>
#include <string>
using namespace std;
class Student {
    private:
    string name;
    string subject;
    int marks;
    public:
    Student(string n, string s, int m)
    {
        name = n;
        subject = s;
        marks = m;
    } 
    void display() {
            string grade;
            if (marks >= 90) grade = "A";
            else if (marks >= 75) grade = "B";
            else if (marks >= 50) grade = "C";
            else grade = "F";
            
            cout << "Name: " << name << "\n";
            cout << "Subject: " << subject << "\n";
            cout << "Marks: " << marks << "\n";
            cout << "Grade: " << grade << ;
        }
};

int main() {
    string name, subject;
    int marks;
    getline(cin, name);
    getline(cin, subject);
    cin >> marks;
    
    Student s(name, subject, marks);
    s.display();
    
    return 0;
}