import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		
		String str = "";
		for (int i = 0; i < n; i++) {
			String s = sc.next();
			str += s;
		}
		System.out.println(str);
		sc.close();
	}
}