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

int main()
{
	int N;
	cin >> N;
	deque<char> que;
	for( int i = 0; i < N; i++ ) {
		int T;
		char S;
		cin >> T >> S;
		if( T ) que.push_front( S );
		else que.push_back( S );
	}

	for( int i = 0; i < N; i++ ) {
		char ans = que.front();
		que.pop_front();
		cout << ans;
	}
	cout << endl;
}