using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Въведи оценка A,B, C, D, F");

        char grade = char.Parse(Console.ReadLine());

        switch (grade)

        {

            case 'A':

            Console.WriteLine("Excellent");

            break;

            case 'B':

            Console.WriteLine("Well done");

            break;

            case 'C':

            Console.WriteLine("Well done");

            break;

            case 'D':

            Console.WriteLine("You passed");

            break;

            case 'F':

            Console.WriteLine("Better try again");

            break;

            default:

            Console.WriteLine("Error");

            break;

        }

    }

}