#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
#include <cmath>
#include <cctype>

using namespace std;


class Animal {
        string sound;
    public:
        Animal(string sound){
            this->sound = sound;
        }
        void makeSound(){
            cout << sound << endl;
        }
};
class Dog : public Animal {
    public:
        Dog(string sound = "Woof!")
            :Animal(sound)
        {
        }

};
class Cat : public Animal {
    public:
        Cat(string sound = "Miaw!")
            :Animal(sound)
        {
        }
};

int main(){

    Dog dog;
    dog.makeSound();

    Cat cat("Mew!");
    cat.makeSound();

    return 0;
}