#include <iostream>
using namespace std;
 
class B;
 
class A
{
friend class B;
public:
  void publicMethod();
private:
  void privateMethod();
};
 
class B
{
friend void A::publicMethod();
friend void A::privateMethod();
private:
  void foo();
};
 
void A::publicMethod()
{
	B b;
	cout << "public ";
	b.foo();
	privateMethod();
}
 
void A::privateMethod()
{
	B b;
	cout << "private ";
	b.foo();
}
 
void B::foo()
{
  cout << "foo\n";
}
int main()
{
	A a;
	a.publicMethod();
	return 0;
}

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