#include <iostream>
#include <cstring>
using namespace std;
int main(){
    int m,ns;
    string s,n;
    cin>>n;
    cin>>s;
    cout<<"\n";
    cin>>m;
    ns=n.length();
    if((ns<1&&ns>100)&&(m>=-100&&m<=100){
        cout<<"Invalid input";
    }
    else{
    if(m>=90){
        cout<<"Name: ";
        cout<<n;
        cout<<"\n";
        cout<<"Subject: ";
        cout<<s;
        cout<<"\n";
        cout<<"Marks: ";
        cout<<m;
        cout<<"\n";
        cout<<"Grade: ";
        cout<<"A";
        cout<<"\n";
    }
    else if(m>=75&&m<90){
         cout<<"Name: ";
        cout<<n;
        cout<<"\n";
        cout<<"Subject: ";
        cout<<s;
        cout<<"\n";
        cout<<"Marks: ";
        cout<<m;
        cout<<"\n";
        cout<<"Grade: ";
        cout<<"B";
        cout<<"\n";
    }
    else if(m>=50&&m<75){
         cout<<"Name: ";
        cout<<n;
        cout<<"\n";
        cout<<"Subject: ";
        cout<<s;
        cout<<"\n";
        cout<<"Marks: ";
        cout<<m;
        cout<<"\n";
        cout<<"Grade: ";
        cout<<"C";
        cout<<"\n";
        
    }else{
         cout<<"Name: ";
        cout<<n;
        cout<<"\n";
        cout<<"Subject: ";
        cout<<s;
        cout<<"\n";
        cout<<"Marks: ";
        cout<<m;
        cout<<"\n";
        cout<<"Grade: ";
        cout<<"F";
        cout<<"\n";;
        
    }
    }
    
    
    
    
    
    
    
}