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

int main() {
    deque<char> ans;
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        int t;
        char s;
        cin >> t >> s;
        if (t == 0) {
            ans.push_back(s);
        } else {
            ans.push_front(s);
        }
    }
    for (char c : ans) {
        cout << c;
    }
    cout << endl;
}