using System;

interface IAnimal
{
    string Breathe();
    string Eat();
    string Sleep();
}

interface IHavePet
{
    IAnimal GetPet();
}

class Human : IAnimal, IHavePet
{
    Dog dog = new Dog();

    public string Breathe() => "Human.Breathe";
    public string Eat() => "Human.Eat";
    public string Sleep() => "Human.Sleep";

    public IAnimal GetPet() => dog;
}

class Dog : IAnimal
{
    public string Breathe() => "Dog.Breathe";
    public string Eat() => "Dog.Eat";
    public string Sleep() => "Dog.Sleep";
}

class Program
{
    static string GiveFood(IAnimal animal)
        => animal switch
        {
            IHavePet human => human.GetPet().Eat(),
            _ => animal.Eat()
        };

    static void Main()
    {
        Console.WriteLine("Human: " + GiveFood(new Human()));
        Console.WriteLine("Dog: " + GiveFood(new Dog()));
    }
}