#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#ifdef LOCAL
#include "algo/debug.h"
#else
#define debug(...) (void(0))
#endif
void run_case();
int main() {
	std::ios_base::sync_with_stdio(false);
	std::cin.tie(nullptr);
	int T = 1;
	// cin >> T;
	while (T--) run_case();
	return 0;
}
void run_case() {
	int N;
	cin >> N;
	string h, t;
	while(N--) {
		int op;
		char s;
		cin >> op >> s;
		if(op == 0) t += s;
		else h += s;
	}
	reverse(h.begin(), h.end());
	cout << h + t << endl;
}