using System;

using System.Threading;

public class Program

{

    static void WriteSecond()

    {

        while (true)

        {

            Console.WriteLine("Secondary");

        }

    }

    public static void Main()

    {

        ThreadStart writesecond = new ThreadStart(WriteSecond);

        Thread thread = new Thread(writesecond);

        thread.Start();

        while (true)

        {

            Console.WriteLine("Primary");

        }

    }

}