#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; i++) cin >> a[i];
  sort(a, a + n);
  int r = n - n / 2;
  int b[n];
  int j = 0;
  for (int i = 0; i < n; i += 2) {
    b[i] = a[j];
    j++;
  }
  for (int i = 1; i < n; i += 2) {
    b[i] = a[r];
    r++;
  }
  for (int i = 0; i < n; i++) {
    cout << b[i] << " ";
  }
  cout << endl;
}
