using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter a string");

        string s1=Console.ReadLine();

         s1=s1.ToUpper();

        Console.WriteLine("\nstring change to uppercase:- "+s1);

        s1=s1.ToLower();

        Console.WriteLine("\nstring change to lowercase "+s1);

        string [] str=s1.Split(' ');

        Console.WriteLine("string split into string Array");

        foreach(string s2 in str)

        {

            Console.WriteLine(s2);

        }

    }

}