#include <iostream.h>

class Human
{
public:
	void Human_identify(void);
private:	
	int a;
};

void Human::Human_identify()
{
	cout<<"Human!\n";
}


class Adult:public Human
{
public:
	void Adult_identify(void);
private:
	int b;
};

void Adult::Adult_identify()
{
	cout<<"Adult!\n";
}


class Youth:public Human
{
public:
	void Youth_identify(void);
private:
	int c;
};

void Youth::Youth_identify()
{
	cout<<"Youth!\n";
}

void main()
{
	Human h;
	Adult a;
	Youth y;
	h.Human_identify();
	a.Adult_identify();	
	y.Youth_identify();
}