#include <iostream>
using namespace std;

class Enemy
{
public:
    virtual void attack()
    {

    }
};

class Ninja :public Enemy
{
public:
    void attack()
    {
        cout << "ninja attack!" << endl;
    }
};

class Monster :public Enemy
{
public:
    void attack()
    {
        cout << "mponster attack!" << endl;
    }
};

int main()
{
    Ninja n;
    Monster m;
    Enemy *enemy1 = &n;
    Enemy *enemy2 = &m;
    enemy1->attack();
    enemy2->attack();

    system("pause");
    return 0;
}