#include <bits/stdc++.h>
using namespace std;
int n,z,i;
main(){
	cin>>n;
	deque<char> A;
	for(i=0;n>i;i++){char y;cin>>z>>y;if(z)A.push_front(y);else A.push_back(y);}
	for(i=0;n>i;i++){cout<<A.front();A.pop_front();}
}