#include<cstdio>
#include<algorithm>
using namespace std;
bool k[50005];
int main()
{
    freopen("economie.in","r",stdin);freopen("economie.out","w",stdout);
    int v[1500],n,i,lim,j;bool ok=0;
    scanf("%d",&n);
    for(i=1;i<=n;++i)
        scanf("%d",&v[i]);
    sort(v+1,v+n+1);
    lim=v[n];
    for(i=1;i<=n&&ok;++i)
    {
        ok=1;
        for(j=i;j<=lim;j+=i)
            k[j]=1;
        for(j=i+1;j<=n&&ok;++j)
            if(!k[v[j]])
                ok=0;
    }
    printf("%d\n",i);
    for(j=i;j>=1;--j)
        printf("%d\n",v[j]);
}