using System;

public class Program

{

    public static void Main()

    {

        Cat mia = new Cat();

        Console.WriteLine("Cat:");

        mia.Walking();

        Fish nemo = new Fish() ; 

        Console.WriteLine("Fish:");

        nemo.Swimming();

        Dog nina = new Dog();

        Console.WriteLine("Dog:");

        nina.Walking();

        Bird tuca = new Bird(); 

        Console.WriteLine("Bird:");

        tuca.Vocalising();

        tuca.Fly();

    } 

}

class Animal

{public void Vocalising()

{

Console.WriteLine("I'm emitting sounds! Isn't that amazing human?");

}

}

class Dog : Animal

{

public void Walking()

{

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

}

}

class Fish : Animal 

{

public void Swimming()

{

Console.WriteLine("I'm swimming. That's cool, rigth?");

}

}

class Cat : Animal

{

public void Walking()

{

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

}

} 

class Bird : Animal

{

public void Fly()

{

Console.WriteLine("I also know how to fly! I  happen to be flying right now, as a matter of fact...");

}

}