#include <fstream>
#include <iostream>
#include <string>

int main() {

	//std::ifstream inf("Text.txt");	std::cin.rdbuf(inf.rdbuf());

	int N;
	std::cin >> N;
	std::string S;

	for (int i = 0; i < N; i++) {
		std::cin >> S;
		std::cout << S;
	}

	std::cout << std::endl;

	return 0;
}