#include <iostream>
using namespace std;
class Marks{
    protected:
    int math, science, english;
    public:
    void setMarks(int m, int s, int e){
        math = m;
        science = s;
        english = e;
    }
    int getMarksTotal(){
       return math + science + english; 
    }
};
class Activities{
    protected:
    int activityMarks;
    public:
    void setActivityMarks(int a)}
    activityMarks = a;
}
int getActivityMarks(){
    return activityMarks;
}
};
class Result : public Marks, public Activities{
    public:
    void computeresult(){
        int total = getMarksTotal() + getActivityMarks();
        char grade;
        if(total>=250)
        grade = 'A';
        else if(total>=200)
        grade = 'B';
        else if(total>=150)
        grade = 'c';
        else
        grade = 'F';
        cout<<total<<" "<<grade;
    }
};
int main(){
    int m,s,e,a;
    cin>>m>>s>>e;
    cin>>a;
    if(m<0||m>100||s<0||s>100||e<0||e>100||a<0||a>100){
        cout<<"Invalid input";
        return 0;
    }
    Result r;
    r.setMarks(m,s,e);
    r.setActivityMarks(a);
    r.computeResult();
    return 0;
}