using System;

public class Program

{

    public static void Main()

    {

        int k = 3; 

        string s = "";

        while(k>-1)

        { 

            s = k + " " + s; //Every time we loop, append k's value to our string (on the front)

            k--;

            Console.WriteLine(String.Format("Print out for testing, s is: {0}", s)); //Intermittent value of s for testing

        }

        Console.WriteLine(s); //only print the end result at the end

    }

}