#include <iostream>
#include <set>
using namespace std;
 
 
int main() {
	std::set<string> to_be_inserted;
	std::set<string> res;
	cout << "check everything is fine" << endl;
	res.insert(to_be_inserted.begin(), to_be_inserted.end());
    cout << "how about now ?" << endl;
	return 0;
}