#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

int main() {
    int n;
    cin >> n;
    string result = ""s;
    rep(i, n) {
        int t;
        char c;
        cin >> t >> c;
        if(t) result = c + result;
        else result += c;
    }
    cout << result << "\n";
}