#include <iostream>
using namespace std;

template <typename T>
class A
{
public:
	class B
	{
		T k; friend class A;
	public:
		T getK () { return k; }
	};

	B myB;

	void changeB( T z )
	{ myB.k = z; }
};

int main()
{
	A<int> a;
	a.changeB(10);
	cout << a.myB.getK() << endl;
}