using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter the first string");

        string strone = Console.ReadLine();

        Console.WriteLine("Enter the second string");

        string strtwo = Console.ReadLine();

        strone = strone.Trim();

        strtwo = strtwo.Trim();

        strone = strone.ToLower();

        strtwo = strtwo.ToLower();

        if (strone == strtwo)

        {

            Console.WriteLine("Equal");

        }

        else

        {

            Console.WriteLine("Not Equal");

        }

        string strcelebrate = "Celebrating 200 year of Indiana University";

        int intIndex = strcelebrate.IndexOf("year"); //4

        string strnew = strcelebrate.Insert(intIndex + 4, "s");

        Console.WriteLine("New String: " + strnew);

    }

}