#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  list<char> s;
  int n;
  cin >> n;
  REP (i, n) {
    int t;
    char c;
    cin >> t >> c;
    if (t)
      s.push_front(c);
    else
      s.push_back(c);
  }
  
  string ret;
  for (char c: s)
    ret += c;
  cout << ret << endl;
  
  return 0;
}