#include <iostream>

using namespace std;

class Cc {
	private:
		Aa *aa;
	public:
		Cc(int a) {
			std::cout << "a=" << a << std::endl;
		}

};

class Bb {
	private:
		Cc *c;
	public:
		Bb(Cc&) { }
};

class Aa {
	private:
		Bb *b;
	public:
		Aa() { }
};


int main() {
	Aa a;
}