#include <iostream>
using namespace std;

class Animal {
public:
    virtual void sound() {
        cout << "Animal sound\n";
    }
};

class Dog : public Animal {
public:
    void bark() {
        cout << "Woof!\n";
    }
};

class Cat : public Animal {
public:
    void meow() {
        cout << "Meow!\n";
    }
};

int main() {
    Animal* a = new Dog();

    Dog* d = dynamic_cast<Dog*>(a);

    if (d != nullptr) {
        d->bark();
    } else {
        cout << "Not a Dog\n";
    }

    delete a;
}