using System;

​

public class Program

{

    public static void Main()

    {

        Console.Write("Enter a character: ");

        char c = (char)Console.ReadLine()[0]; // only check the first character

        if (Char.IsLetter(c))

        {

            if (Char.IsLower(c))

            {

                Console.WriteLine("The character is lowercase.");

            }

            else

            {

                Console.WriteLine("The character is uppercase.");

            }

        }

        else

        {

            Console.WriteLine("The character isn't an alphabetic character.");

        }

    }

}