using System;
using System.Linq;
using System.Collections.Concurrent;

public class Program
{
	public static void Main()
	{
		bool login = false;
		while (login == false)
		{
			string todo = Console.ReadLine().ToLowerInvariant();
			if (todo.Equals("login"))
			{

			}
			else if (todo.Equals("register"))
			{

			}
			else
			{
				Console.WriteLine("Invalid command");
			}
		}
	}
	private static string getUsername()
	{
		Console.Write("Username: ");
		string inputUsername = Console.ReadLine();
		return inputUsername;
	}
	private static string getPassword()
	{
		Console.Write("Username: ");
		string inputPassword = Console.ReadLine();
		return inputPassword;
	}
}