using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp7
{
    class Note
    {
        List<User> userID;

        public Note ()
        {
            userID = new List<User>();
        }

        public void AddUser(User another)
        {
            userID.Add(another);
        }

        public void List()
        {

            userID.ForEach(a =>
           {
               Console.WriteLine(a);
           });
        }
    }



    class Book
    {
        List<Note> note;
        string bookID;


        public void AddNote(Note another)
        {
            note.Add(another);
        }

        public void ShowAllNotes()
        {

            note.ForEach(a =>
            {
                Console.WriteLine(a);
            });
        }
    }

    class User
    {
        string ID;
        string password;

        public User (string ID, string password)
        {
            this.ID = ID;
            this.password = password;
        }

    }

    class Program
    {
        static void Main(string[] args)
        {

            string stop = null;
            Note one = new Note();


            while (stop != "Stop")
            {
                Console.WriteLine("Введите ваш ник и пароль:");
                string userName = Console.ReadLine();
                string userPassword = Console.ReadLine();
                User o = new User(userName, userPassword);
                one.AddUser(o);
                stop = Console.ReadLine();
            }
        }
    }
}