import java.util.*;

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

			System.out.println(ans);
			sc.close();
		}
	}