using System;

public class Program

{

    public static void Main()

    {

        //1

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

        string str1 = Console.ReadLine();

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

        string str2 = Console.ReadLine();

        str1 = str1.ToUpper();

        str2 = str2.ToUpper();

        str1 = str1.Trim();

        str2 = str2.Trim();

        if (str1 == str2)

        { Console.WriteLine("Equal");

    }

        else

        { Console.WriteLine("Not Equal");

        }

    //2 

        string str3 = "Celebrating 200 year of Indiana University";

        int year_postion = str3.IndexOf("year");

        str3= str3.Insert(year_postion +4 ,"s");

        Console.WriteLine(str3);

    }

}