using System;

public class Program

{

    public static void Main()

    {

        public static void Main()

Console.WriteLine("your grade");

var grade=Console.ReadLine();

switch (grade)

{

case "A":Console.WriteLine("Excellent");break;

case "B":Console.WriteLine("Very Good");break;

case "C":Console.WriteLine("Very Good");break;

case "D":Console.WriteLine("Good");break;

case "E":Console.WriteLine("Middle");break;

case "F":Console.WriteLine("Bad");break;

default : Console.WriteLine("Invalid grade");break;

}

}

}