#include <iostream>
#include <string>
#include <sstream>
using namespace std;

class mystring {
public:
	string operator+(int i) {
		ostringstream ost;
		ost << i;
		return ost.str();
	}
};

int main()
{
	mystring s;
	int i = 12345;
	cout << s + i << "\n"; //convert i from int to string by adding it to s
}