#include <bits/stdc++.h>
using namespace std;
int main(){
    deque<char> dq;
    int n;
    cin >> n;
    for(int i = 0; i < n; ++i){
        char t, s;
        cin >> t >> s;
        if(t == '0'){
            dq.emplace_back(s);        
        }else{
            dq.emplace_front(s);
        }
    }
    while(!dq.empty()){
        cout << dq.front(); dq.pop_front();
    }
    cout << '\n';

}