#include <iostream>
using namespace std;
 
template <class T>
class A
{
    public:
		A(T a): a(a) {;}
		friend ostream& operator<<(ostream& os, A<T>& ob)
		{
			return os << ob.a << endl;
		}
 
	T a;
};
 
template <class T>
class B
{
	public:
		B(T a): a(a) {;}
		template <class X>
		friend ostream& operator<<(ostream&, B<X>&);
 
		T a;
};
 
template <class X>
ostream& operator<<(ostream& os, B<X>& ob)
{
	return os << ob.a << endl;
}
 
int main()
{
	A<int> a(10);
	B<int> b(20);
	cout << a;
	cout << b;
	return 0;
}

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