using System;

public class Program

{

    public static void Main()

    {

        // #1 

        string strItemCode = "sony-dvd-062019";

        // find date information 

        int firstDash = strItemCode.IndexOf("-");

        int secondDash = strItemCode.IndexOf("-", firstDash + 1);

        string month = strItemCode.Substring(secondDash + 1, 2);

        int monthIndex = strItemCode.IndexOf(month);

        string year = strItemCode.Substring(monthIndex + 2, 4);

        // split code by the dash 

        string[] x = strItemCode.Split('-');

        string manufacturer = x[0];

        string product = x[1]; 

        // print results 

        string output = String.Format("Manufacturer: {0}, Product: {1}, Month: {2}, Year: {3}", manufacturer, product, month, year);    

        Console.WriteLine(output);

        // #2 

        Console.WriteLine("Enter an email address: ");

        string email = Console.ReadLine();

        // checks if email is valid 

        if(!email.Contains("@"))

        {

            Console.WriteLine("Not a valid email. Please try again.");

            Console.WriteLine("Enter an email address: ");

            email = Console.ReadLine();

        }

        // find username 

        int usernameIndex = email.IndexOf("@");

        string username = email.Substring(0, usernameIndex);

        Console.WriteLine(username);

        // find domain 

        string domain = email.Substring(usernameIndex + 1);

        Console.WriteLine(domain);

    }

}