#include <iostream>

template <typename T>
class sgink
{
public:
	void pri();
	
private:
    struct node
    {
        T data;
        node* next{nullptr};
    };
    
    node head;
};

template <typename T>
void sgink<T>::pri()
{
    std::cout << head.data << std::endl;
}

int main()
{
    sgink<int> a;
    a.pri();
    return 0;
}