import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No00000597_Main {
	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	public static void main(String[] args) throws IOException {
		int n = Integer.parseInt(br.readLine());
		String s = "";
		for(int i = 0; i < n; i++) {
			s += br.readLine();
		}
		System.out.println(s);
	}
}