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

int main(){
	cin.tie(0),ios::sync_with_stdio(false);
	int n; cin>>n;
	deque<char>q;
	for(int i=0;i<n;++i){
		int t; char c; cin>>t>>c;
		if(t)q.push_front(c);
		else q.push_back(c);
	}
	while(q.size()){
		cout<<q.front();
		q.pop_front();
	}
	cout<<"\n"s;
}