#include<cstdio>
#include<algorithm>
using namespace std;
int a[1001],b[50001],i,j,k,n,c[1001];
int main()
{freopen("economie.in","r",stdin),freopen("economie.out","w",stdout);
scanf("%d",&n);
for(i=1;i<=n;i++)
      scanf("%d",&a[i]);
sort(a+1,a+n+1);
for(i=1;i<=n;i++)
if(!b[a[i]])
      {c[k++]=a[i];
      for(j=1;j*a[i]<=50000;j++)
           b[j*a[i]]=1;}
printf("%d\n",k);
for(i=0;i<k;i++)
      printf("%d\n",c[i]);
return 0;}