#include<cstdio>
#include<algorithm>
using namespace std;
int a[1001],b[50001],i,j,k,n,c[1001];
int main()
{FILE *f=fopen("economie.in","r"),*g=fopen("economie.out","w");
fscanf(f,"%d",&n);
for(i=1;i<=n;i++)
      fscanf(f,"%d",&a[i]);
sort(a+1,a+n+1);
for(i=2;i<=n;i++)
for(j=2;j*a[i-1]<=a[n];j++)
      b[j*a[i-1]]=1;
for(i=1;i<=n;i++)
if(!b[a[i]])
      c[++k]=a[i];
fprintf(g,"%d\n",k);
for(i=1;i<=k;i++)
      fprintf(g,"%d\n",c[i]);
return 0;}