#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;

    deque<string> q(n);

    for (int i = 0; i < n; ++i)
    {
        int f;
        string s;

        cin >> f >> s;

        if (f == 0)
            q.push_back(s);
        else
            q.push_front(s);
    }

    for(auto s : q)
        cout << s;

    cout << "\n";

    return 0;
}