import java.util.*;
public class Main {

  public static void main(String[] args) { 
      Scanner sc = new Scanner(System.in);
      int n = sc.nextInt();
      Deque<Character> deque = new LinkedList<>();
      for(int i = 0; i < n; i++) {
        int t = sc.nextInt();
        char c = sc.next().charAt(0);
        if(t == 0) { // tail
          deque.addLast(c);
        } else { // head
          deque.addFirst(c);
        }
      }
      StringBuilder sb = new StringBuilder();
      while(!deque.isEmpty())
        sb.append(deque.pollFirst());
      System.out.println(sb.toString());
  }
}