#include <bits/stdc++.h>
using namespace std;

int main() {
  int n; cin >> n;
  string ans, head;
  for (int i = 0; i < n; i++) {
    int t; char s; cin >> t >> s;
    if (t) head += s;
    else ans += s;
  }
  reverse(head.begin(), head.end());
  cout << head + ans << "\n";
  return 0;
}