#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin ("economie.in");
ofstream fout ("economie.out");
int n,i,s,k,v[1001],h[1001];
int main()
{
    fin>>n;
    for (i=1; i<=n; i++)
        fin>>v[i];
    sort (v+1,v+n+1);
    s=v[1];
    h[++k]=v[1];
    for (i=2; i<=n; i++)
    {
        if (v[i]%s!=0)
        {
            h[++k]=v[i];
            s=s+v[i];
        }
    }
    fout<<k<<"\n";
    for (i=1; i<=k; i++)
        fout<<h[i]<<" ";
    return 0;
}