#include <bits/stdc++.h>
#pragma warning(disable : 4996)
#pragma comment(linker, "/STACK:336777216")
using namespace std;
int IT_MAX = 1 << 19;
const long long MOD = 998244353;
const int INF = 0x3f3f3f3f;
const long long LL_INF = 0x3f3f3f3f3f3f3f3f;
const double PI = acos(-1);
const double ERR = 1e-10;
int main() {
  int n, a[109];
  deque<int> d;
  cin >> n;
  for (int i = 0; i < n; i++) cin >> a[i];
  sort(a, a + n);
  for (int i = 0; i < n; i++)
    if (i % 2 == 0)
      d.push_back(a[i]);
    else
      d.push_front(a[i]);
  for (long long x : d) cout << x << " ";
  return 0;
}
