#include <iostream>
#include <string>

int main()
{
	int N;

	while (std::cin >> N)
	{
		std::string ConnectedString = "";
		for (int i = 0; i < N; i++)
		{
			std::string Str;
			std::cin >> Str;
			ConnectedString += Str;
		}

		std::cout << ConnectedString << std::endl;
	}

	return 0;
}