#include <bits/stdc++.h>
#define int long long
using namespace std;
const int MOD = 1000000007;
using Graph = vector<vector<int>>;

signed main() {
  int N;
  cin >> N;
  
  deque<char> d;
  for( int i = 0; i < N; i++ ){
    int T;
    cin >> T;
    char C;
    cin >> C;
    if( T == 0 ) d.push_back(C);
    else d.push_front(C);
  }
  
  while( !d.empty() ){
    cout << d.front();
    d.pop_front();
  }
  cout << endl;
}