#include<bits/stdc++.h>

using namespace std;
using ll = long long int;
using lc = complex<double>;

int main(void) {
    constexpr ll MOD = 1e9 + 7;
    constexpr double PI = acos(-1);
    cout << fixed << setprecision(32);
    cin.tie(0); ios::sync_with_stdio(false);

    ll n;
    cin >> n;
    string s, t;
    while(n--) {
        ll x;
        string ss;
        cin >> x >> ss;
        (x ? s : t) += ss[0];
    }
    reverse(s.begin(), s.end());
    cout << s << t << endl;
}