/* -*- coding: utf-8 -*-
 *
 * 1026.cc:  No.1026 OGAWA's New Keyboard - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

/* global variables */

char s[MAX_N * 2 + 4];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);

  int hp = MAX_N, tp = MAX_N;
  while (n--) {
    int t;
    char w[4];
    scanf("%d%s", &t, w);

    if (t == 0) s[tp++] = w[0];
    else s[--hp] = w[0];
  }

  for (int i = hp; i < tp; i++) putchar(s[i]);
  putchar('\n');
  return 0;
}