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

int main(){
    string fr, ba;
    int n, t;
    char c;
    cin >> n;
    for(int i = 0; i < n; i++){
        cin >> t >> c;
        if(t & 1)fr += c;
        else ba += c;
    }
    reverse(fr.begin(), fr.end());
    cout << fr << ba << endl;
}