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

int main(){
	cin.tie(0),ios::sync_with_stdio(false);
	int n; cin>>n;
	string ans,head;
	for(int i=0;i<n;++i){
		int t; char s; cin>>t>>s;
		if(t)head+=s;
		else ans+=s;
	}
	reverse(head.begin(),head.end());
	cout<<head+ans<<"\n"s;
}