#include<iostream>
using namespace std;
int main(){
string name,subject;
int marks;
getline(cin,name);
getline(cin,subject);
cin>>marks;

 char grade;
      if(marks>=90) grade='A';
      else if(marks>=75) grade='B';
      else if(marks>=50) grade='C';
      else grade='F';
      
      cout<<"Name: "<<name;
      cout<<"Subject: "<<subject;
      cout<<"Marks: "<<marks;
      cout<<"Grade: "<<\ngrade;
       
}