using System;

public class Program

{

    public static void Main()

    {

        string letter_grade;

        Console.WriteLine("Please enter your letter grade (A to F)");

        letter_grade = Convert.ToString(Console.ReadLine());

        if (letter_grade == "A")

        {

            Console.WriteLine("Numerical Equivalent: 90-100%");

            Console.WriteLine("Description: WD");

        }

        else if (letter_grade == "B")

        {

            Console.WriteLine("Numerical Equivalent: 85-89%");

            Console.WriteLine("Description: WD");       

         }

        else if (letter_grade == "C")

        {

            Console.WriteLine("Numerical Equivalent: 80-84%");

            Console.WriteLine("Description: P");

         }

        else if (letter_grade == "D")

        {

            Console.WriteLine("Numerical Equivalent: 75-79%");

            Console.WriteLine("Description: N");

         }

        else if (letter_grade == "F")

        {

            Console.WriteLine("Numerical Equivalent: <75");

            Console.WriteLine("Description: N");

         }

    }

}