#include<iostream>
#include<fstream>

using namespace std;

ifstream fin("economie.in");
ofstream fout("economie.out");

int V[1002],n,i,j,k,update[1002],affirmative,x,minim,ciur[50006];

int cmp(int i, int j)
	{
		return j>i;
	}

int main()

{
	fin>>n;
	for(i=1;i<=n;i++)
		fin>>V[i];
	sort(V,V+n+1,cmp);
	update[1]=V[1];
	ciur[V[1]]=1;
	minim++;
	affirmative=1;
	k=2;
	
	
	
	for(i=2;i<=n;i++)
	{
		for(x=2;x*V[i-1]<=V[n];x++)
			ciur[x*V[i-1]]=1;
		if(ciur[V[i]]==0)
			{
				minim++;
				update[k++]=V[i];
			}
		
	}
	fout<<minim<<"\n";
	for(i=1;i<=k-1;i++)
		fout<<update[i]<<" ";
	return 0;
}