using System;

using System.Collections.Generic;

​

​

public class Program

{

    static void Main(string[] args)

    {

        ///Expected output: should display all animals on the list walking

        List<Animal> walkingAnimals = new List<Animal>();

​

        walkingAnimals.Add(new Bird());

        walkingAnimals.Add(new Cat());

​

        foreach (var walkingAnimal in walkingAnimals)

        {

            MakeMeWalk(walkingAnimal);

        }

    }

​

    private static void MakeMeWalk(Animal walkingAnimal)

    {

        walkingAnimal.Walk();

    }

}

​

public abstract class Animal

{

    public abstract void Eat();

​

    public abstract void Breath();

​

    public abstract void Walk();

}

​

public interface IWalkable

{

    void Walk()

    {

        Console.WriteLine("I'm walking");

    }

}

​

public interface IFlyable

{

    void Fly();

}

​

public class Cat : Animal

{

​

    public override void Eat()

    {

        Console.WriteLine("I'm eating");

    }

​

    public override void Walk()

    {

        Console.WriteLine("I'm a cat and I'm walking");

    }

​

    public override void Breath()

    {

        Console.WriteLine("I'm breating! (overrided)");

    }

}

​

​

public class Bird : Animal

{

    public override void Eat()

    {

        Console.WriteLine("I'm eating");

    }

​

    public override void Walk()

    {

        Console.WriteLine("I'm a bird and I'm walking");

    }

​

    public override void Breath()

    {

        Console.WriteLine("I'm breating! (overrided)");

    }

​

}