#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 = "", temp1 = "", temp2 = "";
    cin >> n;
    for (int i = 0; i < n; i++){
        char c;
        int t;
        cin >> t >> c;
        if (t == 0) temp1 += c;
        else  temp2 = c + temp2;
        if (!(i%500) || i == n-1){
            s += temp1;
            s = temp2 + s;
            temp1 = "";
            temp2 = "";
        }
    }
    cout << s << endl;
}