using System;

public class Program

{

        public static void Main(string[] args)

        {

            char grade;

           Console.WriteLine("enter you are grade");

            grade=Convert.ToChar(Console.ReadLine());

            switch(grade)

            {

                case'A':

                case'a':Console.WriteLine("Excellent!");break;

                case'B':

                case'b':Console.WriteLine("Well Done");break;

                case'C':

                case'c':Console.WriteLine("Good");break;

                case'D':

                case'd':Console.WriteLine("you Passed");break;

                case'F':

                case'f':Console.WriteLine("Better try again");break;

                default:Console.WriteLine("you Failed!");break;

            }

        }

}

​