using System;

public class Program

{

    public static void Main()

    {   

        SayHello(DateTime.Now);

        SayHello(DateTime.Now.AddHours(6));

    }

    private static void SayHello(DateTime time)

    {

        if (time.Hour >= 4 && time.Hour < 12)

        {

            Console.WriteLine(String.Format("good morning sir. It's {0} o'clock right now.", time));

        }

        else

        {                 

             Console.WriteLine(String.Format("good afternoon sir. It's {0} o'clock right now.", time));

        }       

    }

}