#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("economie.in");
ofstream g("economie.out");

int n, a[1005], sol[1005], dim;

int main()
{
    f>>n;
    for (int i=1; i<=n; ++i) f>>a[i];

    sort(a+1, a+n+1); sol[++dim]=a[1];
    for (int i=2; i<=n; ++i)
    {
        bool ok=1;
        for (int j=1; j<i && ok; ++j)
            if (a[i]%a[j]==0) ok=0;

        if (ok) sol[++dim]=a[i];
    }
    g<<dim<<'\n';
    for (int i=1; i<=dim; ++i) g<<sol[i]<<'\n';

    return 0;
}