#include <iostream>
#include <string>

using namespace std;
int main() 
{
	string r_b;
	string r_f;
	int N;
	cin >> N;
	for (int i = 0; i < N; ++i)
	{
		int T;
		string S;
		cin >> T;
		cin >> S;
		if (T == 0)
			r_b += S;
		else
			r_f += S;
	}
	string r;
	for (int i = r_f.length() - 1; i >= 0; --i)
		r += r_f[i];
	r += r_b;
	cout << r << endl;
	return 0;
}