#include <iostream>
#include <fstream>
using namespace std;
int v[1001],i,n,j;
int main()
{
    ifstream fin("halfsort2.in");
    ofstream fout("halfsort2.out");
    fin>>n;
    for(i=1; i<=n; i++)
        fin>>v[i];
    for(i=1; i<n; i+=2)
        for(j=i+2; j<=n; j+=2)
            if(v[i]<v[j])
                swap(v[i],v[j]);
     for(i=2; i<n; i+=2)
        for(j=i+2; j<=n; j+=2)
            if(v[i]>v[j])
                swap(v[i],v[j]);



    for(i=1; i<=n; i++)
        fout<<v[i]<<" " ;
    fin.close();
    fout.close();

    return 0;
}