#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int N, T;
char c;
deque<char> deq;


int main() {
  cin >> N;
  for (int i = 0; i < N; i++) {
    cin >> T >> c;
    if (T == 0) deq.push_back(c);
    if (T == 1) deq.push_front(c);
  }
  for (auto c: deq) {
    cout << c;
  }
  cout << endl;
  return 0;
}