#include <iostream>
#include <vector>
#include <string>
#include <utility>
#include <algorithm>
#include <climits>
#include <map>
#include <queue>

using namespace std;

int main() {
    int n;
    cin >> n;
    deque<char> deq;
    for (int i=0; i<n; i++) {
        int t;
        char c;
        cin >> t >> c;
        if (!t) deq.push_back(c);
        else deq.push_front(c);
    }

    for (auto c : deq) cout << c;
    cout << endl;
}