using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

​

public class Program

{

    public static void Main()

    {

        D

    }

}

​

public class Book

{

    public string Name {get; set;}

​

    public int Year {get;set;}

​

    public Book(string Name, int Year)

    {

        this.Name = Name;

        this.Year = Year;

    }

​

    public override string ToString()

    {

        return string.Format("{0} {1}", this.Name, this.Year);

    }

}