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

int32_t main()
{
    int n;
    cin >> n;

    deque<char> q;
    for (int i = 0; i < n; i++) {
        int t;
        char c;
        cin >> t >> c;

        if (t) {
            q.push_front(c);
        } else {
            q.push_back(c);
        }
    }

    string str(q.begin(), q.end());

    cout << str << endl;
}