using System;

public class Program

{

    public static void Main()

    {

        /*

        int [] PracArr = {3,1,5,1,6,9};

        Console.WriteLine(PracArr[2]);

        Console.WriteLine("Length: " + PracArr.Length);

        Console.WriteLine("Upper: " + PracArr.GetUpperBound(0));

        Array.Sort(PracArr);

        Console.WriteLine(PracArr[2]);

        */

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

        int index = strName.IndexOf("year");

        strName = strName.Insert(index + 4, "s");

        Console.WriteLine(strName);

    }

}