class User
{
public:
	User(const char*, unsigned);
	 ~User();
	char* getName()const;
	unsigned getAge()const;
	void changeName(const char*);

private:
	char* nickName;
	unsigned age;
};

class Moderator : public User
{
public:
	Moderator(const char* name, unsigned age): User(name,age) {}
private:
};

class Admin : public Moderator
{
public:
	static Admin& getInstance()
	{
	static Admin admin("Anonymous",0);
	return admin;
	}
private:
	Admin(const char* name, unsigned age): Moderator(name,age) {}
};