#include <string>
#include <iostream>
using namespace std;

class AdvancedMediaPlayer
{
public:
    AdvancedMediaPlayer(){}
    virtual ~AdvancedMediaPlayer(){}
    virtual void playVlc(string fileName) = 0;
    virtual void playMp4(string fileName) = 0;
};

class VlcPlayer: public AdvancedMediaPlayer
{
public:
    void playVlc(string fileName)
    {
        cout << "Playing vlc file. Name: " + fileName << endl;
    }
    void playMp4(string fileName)
    {
        cout << fileName + " do nothing" << endl;
    }
};

class Mp4Player: public AdvancedMediaPlayer
{
public:
    void playVlc(string fileName)
    {
        cout << fileName + " do nothing" << endl;
    }
    void playMp4(string fileName)
    {
        cout << "Playing mp4 file. Name: " + fileName << endl;
    }
};