import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        ArrayDeque<Character> deq = new ArrayDeque<>();
        for (int i = 0; i < n; i++) {
            if (sc.nextInt() == 0) {
                deq.addLast(sc.next().charAt(0));
            } else {
                deq.addFirst(sc.next().charAt(0));
            }
        }
        StringBuilder sb = new StringBuilder();
        while (deq.size() > 0) {
            sb.append(deq.poll());
        }
        System.out.println(sb);
    }
}