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using System;
using System.Collections.Generic;

namespace LibraryDemo {
    class Program {
        static void Main(string[] args) {
            var library = new Library();

            library.AddBook(new Book("1984", "George Orwell"));
            library.AddBook(new Book("To Kill a Mockingbird", "Harper Lee"));

            Console.WriteLine("Books in library:");
            foreach (var book in library.Books) {
                Console.WriteLine($"{book.Title} by {book.Author}");
            }
        }
    }

    public class Library {
        public List<Book> Books { get; private set; }

        public Library() {
            Books = new List<Book>();
        }

        public void AddBook(Book book) {
            Books.Add(book);
        }
    }

    public class Book {
        public string Title { get; private set; }
        public string Author { get; private set; }

        public Book(string title, string author) {
            Title = title;
            Author = author;
        }
    }
}