using System;

​

public class Program

{

    public static void Main()

    {

        char c = '$';

        if (!char.IsLetter(c) && !char.IsDigit(c))

        {

            Console.WriteLine($"{c} is neither a letter nor a digit");

        }

        else

        {

            Console.WriteLine($"{c} is a letter or a digit");

        }

    }

}