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

class node {
	virtual void print(ostream& ost) const = 0;
public:
	node *next;
	node(node *initial_next): next(initial_next) {}
	virtual ~node() {}

	friend ostream& operator<<(ostream& ost, const node& n) {
		n.print(ost);
		return ost;
	}
};

class cowboy: public node {
	int i;
public:
	static cowboy *begin;
	cowboy(int initial_i): node(begin), i(initial_i) {begin = this;}
protected:
	void print(ostream& ost) const {ost << "cowboy " << i;}
};

cowboy *cowboy::begin = 0;

class bank: public node {
	int j;
public:
	static bank *begin;
	bank(int initial_j): node(begin), j(initial_j) {begin = this;}
protected:
	void print(ostream& ost) const {ost << "bank " << j;}
};

bank *bank::begin = 0;

class cowboybank: public cowboy, public bank {
	int k;

	void print(ostream& ost) const {
		ost << "cowboybank ";
		cowboy::print(ost);
		ost << ", ";
		bank::print(ost);
		ost << ", " << k;
	}

public:
	cowboybank(int initial_i, int initial_j, int initial_k)
		: cowboy(initial_i), bank(initial_j), k(initial_k) {}
};

int main()
{
	cowboy c1 = 40;
	bank b1 = 80;

	cowboybank cb1(30, 70, 100);
	cowboybank cb2(20, 60, 90);

	cowboy c2 = 10;
	bank b2 = 50;

	cout << "Here are the cowboys:\n";
	for (const node *p = cowboy::begin; p != 0; p = p->next) {
		cout << *p << "\n";
	}

	cout << "\n";

	cout << "Here are the banks:\n";
	for (const node *p = bank::begin; p != 0; p = p->next) {
		cout << *p << "\n";
	}

	return EXIT_SUCCESS;
}