#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
using namespace std;


int main()
{
    int n;
    string s = "", temp = "";
    cin >> n;
    for (int i = 0; i < n; i++){
        char c;
        int t;
        cin >> t >> c;
        if (t == 0) temp += c;
        else{
            if (temp.size()){
                s += temp;
                temp = "";
            }
            s = c + s;
        }
    }
    s += temp;
    cout << s << endl;
}