#include <fstream>
#include<algorithm>
using namespace std;
ifstream f("economie.in");
ofstream g("economie.out");
int n,v[1001],s[50001],i,sol[1001];
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    sort(v+1,v+n+1);
    int k=0;
    s[0]=1;
    for(i=1;i<=n;i++){
        if(s[v[i]]==0)
            sol[++k]=v[i];
        for(int j=v[i];j<=v[n];j+=v[i])
                s[j]=1;
    }
    g<<k<<endl;
    for(i=1;i<=k;i++)
        g<<sol[i]<<" ";
    return 0;
}