using System;

public class Program

{

    public static void Main()

    {

        //Question 1

        Console.WriteLine("Please enter string:");

        string s1 = Console.ReadLine();

        Console.WriteLine("Please enter string:");

        string s2 = Console.ReadLine();

        if (s1.Trim().ToLower() == s2.Trim().ToLower())

        {

            Console.WriteLine("They are equal");

        }

        else

        {   

            Console.WriteLine("They are NOT equal");    

        }

        //Question 2

        string strIU200 = "Celebrating 200 year of Indiana University";

        int iFirstSpace = strIU200.IndexOf(" ");

        int iSecondSpace = strIU200.IndexOf(" ", iFirstSpace+1);

        int iThirdSpace = strIU200.IndexOf(" ", iSecondSpace+1);

        string strIU200s = strIU200.Insert(iThirdSpace, "s");

        Console.WriteLine(strIU200s);

    }

}