import java.util.*;

class Person { protected String firstName; protected String lastName; protected int idNumber;

// Constructor
Person(String firstName, String lastName, int identification){
    this.firstName = firstName;
    this.lastName = lastName;
    this.idNumber = identification;
}

// Print person data
public void printPerson(){
     System.out.println(
            "Name: " + lastName + ", " + firstName 
        +   "\nID: " + idNumber); 
}

}

class Student extends Person{ private int[] testScores;

Student(String firstName,String lastName,int id,int[] testScores){
    super(firstName,lastName,id);
    this.testScores=testScores;
}

 public char calculate(){
    int sum=0;
    int n=testScores.length;
    for(int i=0;i<n;i++){
        sum += testScores[i];
    }
    float avg=sum/n;
    if(avg>=90&&avg<=100){
        return 'O';
    }
    else if(avg>=80){
        return 'E';
    }
    else if(avg>=70){
        return 'A';
     }
    else if(avg>=55){
        return 'P';
    }
    else if(avg>=40){
        return 'D';
    }
    else{
        return 'T';
    }
    //another method without using if-else 
    //return avg>89?'O':avg>79?'E':avg>69?'A':avg>54?'P':avg>39?'D':'T';
}

}

class Solution { public static void main(String[] args) { Scanner scan = new Scanner(System.in); String firstName = scan.next(); String lastName = scan.next(); int id = scan.nextInt(); int numScores = scan.nextInt(); int[] testScores = new int[numScores]; for(int i = 0; i < numScores; i++){ testScores[i] = scan.nextInt(); } scan.close();

    Student s = new Student(firstName, lastName, id, testScores);
    s.printPerson();
    System.out.println("Grade: " + s.calculate() );
}

}