#include<stdio.h>
#include<algorithm>
using namespace std;
int w[1000];
int main () {
	int n,v[1000],a[1000],i,nr=0,x=0,j;
	freopen("economie.in","r",stdin);
	freopen("economie.out","w",stdout);
	scanf("%d",&n);
	for(i=0;i<n;i++)
		scanf("%d",&v[i]);
	sort(v,v+n);
	for(i=0;i<n;i++)
		if(w[i]==0){
			w[i]=1;
			a[x++]=v[i];
			for(j=i+1;j<n;j++){
				if(v[j]%v[i]==0)
					w[j]=1;
			}
		}
	printf("%d\n",x);
	for(i=0;i<x;i++)
		printf("%d\n",a[i]);
	return 0;
}