#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, i, j;
  char s[2010], cop[2010];
  int flag, mid, left, right;
  cin >> n;
  flag = n;
  for (i = 1; i <= n; i++) {
    cin >> s[i];
    if (i == 1) {
      if (flag % 2 == 0) {
        cop[n / 2] = s[i];
        flag = flag - 1;
        mid = n / 2;
      } else {
        cop[(n / 2) + 1] = s[i];
        flag = flag - 1;
        mid = (n / 2) + 1;
      }
      left = mid;
      right = mid;
    } else {
      if (flag % 2 == 0) {
        left = left - 1;
        cop[left] = s[i];
        flag = flag - 1;
      } else {
        right = right + 1;
        cop[right] = s[i];
        flag = flag - 1;
      }
    }
  }
  for (i = 1; i <= n; i++) {
    cout << cop[i];
  }
  return 0;
}
