#include <iostream>
using namespace std;
class Engine{
public:
	int layer1;
	class WaterTank{
	public:
		int layer3;
		class Water{
		public:
			int layer5;
		};
	};
	private:
		int layer8;
		class Tank{
		public:
			int layer9;
		};
	};
private:
	int layer2;
	class EngineRope{
	public:
		int layer6;
		class Rope{
		public:
			int layer7;
		};
	};
	
};

int main(){
	Engine A;
	cout << A.layer1 << A.WaterTank.layer3 << A.WaterTank.Water.layer5
	return 0;
}