#include <bits/stdc++.h>
using namespace std;
int n;
int arr[1005];
int res[1005];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> n;
  for (int i = 0; i < n; ++i) cin >> arr[i];
  sort(arr, arr + n);
  int ini = 0, fin = n - 1, idx = 0;
  while (ini <= fin) {
    res[idx] = arr[ini++];
    res[idx + 1] = arr[fin--];
    idx += 2;
  }
  for (int i = 0; i < n; ++i) cout << res[i] << " ";
  cout << '\n';
  return 0;
}
