#include<bits/stdc++.h>
using namespace std;
int main(){
    int N;
    cin>>N;
    deque<char>d;
    while(N--){
        int t;char s;
        cin>>t>>s;
        t?d.push_front(s):d.push_back(s);
    }
    for(auto s:d)cout<<s;
}