---

using System;

interface Printable
{
    void Print();
}

class Book : Printable
{
    public void Print()
    {
        Console.WriteLine("Книга");
    }
}

class Magazine : Printable
{
    public void Print()
    {
        Console.WriteLine("Журнал");
    }
}

class Program
{
    static void Main()
    {
        Printable[] a = { new Book(), new Magazine() };

        foreach (Printable x in a)
            x.Print();
    }
}