#include <bits/stdc++.h> using namespace std; int main() { int n; cin >> n; queue<char> q; for (int i = 0; i < n; i++) { char c; cin >> c; q.push(c); } while (!q.empty()) { cout << q.front(); q.push(q.front()); q.pop(); q.pop(); } return 0; } //模拟就可以了；