interface Animal {
    void makeSound();
}

class Cat implements Animal {
    @Override
    public void makeSound() {
        System.out.println("Meow!");
    }
}

class Cow implements Animal {
    @Override
    public void makeSound() {
        System.out.println("Moo!");
    }
}

public class P3 {
    public static void main(String[] args) {
        Animal cat = new Cat();
        Animal cow = new Cow();
        
        cat.makeSound();
        cow.makeSound();
    }
}