using System;

​

abstract class Person

{

    abstract public void go();

    abstract public void run();

}

​

class Snake: Person

{

    override public void go()

    {

        Console.WriteLine("Snake go");

    }

    override public void run()

    {

        Console.WriteLine("Snake run");

    }

}

​

class Bird: Person

{

    override public void go()

    {

        Console.WriteLine("Bird go");

    }

    override public void run()

    {

        Console.WriteLine("Bird run");

    }

}

​

​

class Dog: Person

{

    override public void go()

    {

        Console.WriteLine("Dog go");

    }

    override public void run()

    {

        Console.WriteLine("Dog run");

    }

}

​

​

​

public class Program

{

    public static void Main()

    {

        Person d = new Dog();

        Person b = new Bird();

        Person s = new Snake();

        b.go();

        b.run();

        d.go();

        d.run();

        s.go();

        s.run();

    }

}