using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("grade"); 

        var grade= 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("Invalid grade");break; 

    }

}

}