using System;

using System.Linq;

​

class Person{

    protected string firstName;

    protected string lastName;

    protected int id;

    public Person(){}

    public Person(string firstName, string lastName, int identification){

            this.firstName = firstName;

            this.lastName = lastName;

            this.id = identification;

    }

    public void printPerson(){

        Console.WriteLine("Name: " + lastName + ", " + firstName + "\nID: " + id); 

    }

}

​

public class Solution {

    public static void Main() {

        string[] inputs = Console.ReadLine().Split();

        string firstName = inputs[0];

        string lastName = inputs[1];

        int id = Convert.ToInt32(inputs[2]);

        int numScores = Convert.ToInt32(Console.ReadLine());

        inputs = Console.ReadLine().Split();

        int[] scores = new int[numScores];

        for(int i = 0; i < numScores; i++){

            scores[i]= Convert.ToInt32(inputs[i]);

        } 

        Student s = new Student(firstName, lastName, id, scores);

        s.printPerson();

        Console.WriteLine("Grade: " + s.Calculate() + "\n");

    }

}

​

class Student : Person{

    private int[] testScores;  

    /*  

    *   Class Constructor

    *   

    *   Parameters: 

    *   firstName - A string denoting the Person's first name.

    *   lastName - A string denoting the Person's last name.

    *   id - An integer denoting the Person's ID number.

    *   scores - An array of integers denoting the Person's test scores.

    */

    // Write your constructor here

    public Student(string firstName, string lastName, int id, int[] scores)

    {

        this.firstName = firstName;

        this.lastName = lastName;

        this. id = id;

        this.testScores = scores;

    }

    /*  

    *   Method Name: Calculate

    *   Return: A character denoting the grade.

    */

    // Write your method here

    public char Calculate()

    {

        int sum = testScores.Sum()/testScores.Count();

        if(sum >= 90)

            return 'O';

        else if(sum >= 80 && sum < 90)

            return 'E';

        else if(sum >= 70 && sum < 80)

            return 'A';

        else if(sum >= 55 && sum < 70)

            return 'P';

        else if(sum >= 40 && sum < 55)

            return 'D';

        else 

            return 'T'; 

    }

}