using System;

public class Program

{

    public static void Main()

    {

        // Q.1 Ask for strings from user

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

        string str1 = Console.ReadLine();

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

        string str2 = Console.ReadLine();

​

        // Normalize strings by trimming and converting to lower

        str1 = str1.Trim().ToLower();

        str2 = str2.Trim().ToLower();

​

        // Compare the normalized strings

        if (str1 == str2)

        {

            Console.WriteLine("Equal");

        }

        else

        {

            Console.WriteLine("Not Equal");

        }

        // Q.2 Initial string

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

​

        // Find the position of "year" in the string

        int iPositionYear = strSentence.IndexOf("year");

        // Insert "s" one 4 index spaces after "year"

        strSentence = strSentence.Insert(iPositionYear + 4, "s");

​

        // Print the updated string

        Console.WriteLine(strSentence);

    }

}