#include <iostream>

 #include <algorithm>

 using namespace std;

 int arr[+];

 int main() {

     int n;

     while (cin>>n) {

         for (int i=; i<n; i++) cin>>arr[i];

         sort(arr, arr+n);

         cout<<arr[n-];

         for (int i=; i*<n-; i++) {

             if (n-i- == i){

                 cout<<" "<<arr[i];

                 continue;

             }

             cout<<" "<<arr[i]<<" "<<arr[n-i-];

         }

         cout<<endl;

     }

     return ;

 }