What will be the output of the following C++ code?

#include <iostream>  
using namespace std;
class A{
	A(){
		cout<<"A's Constructor called\n";
	}
	friend class B;
};
class B
{
public:
	A a;
	B(){
		cout<"B's constructor called\ns";
	}
};
int main(int argc, char const *argv[])
{
	B b;
	return 0;
}