#include <stdio.h>
# define N 1128
int rez[N],v[N];
int main()
{
	int r=2,n,i,j;
	int inj,gata,aux;
	freopen("economie.in", "r",stdin);
	freopen("economie.out", "w",stdout);
	scanf("%d", &n);
	for(i=1;i<=n;++i)
			scanf("%d", &v[i]);
	inj=n;
	while(inj>1)
	{
		inj/=2;
		do{
			gata=1;
			for(i=1;i<=n-inj;i++)
				if(v[i]>v[i+inj])
				{
					aux=v[i];
					v[i]=v[i+inj];
					v[i+inj]=aux;
					gata=0;
				}
		}
		while(!gata);
	} 
	//for(i=1;i<=n;++i)
		//	printf("%d\n", v[i]);
	
	
	rez[1]=v[1];
	for(i=2;i<=n;++i)
	{
		gata=0;
		for(j=i-1;j>=1;--j)
			if(rez[j])
			{
				if(v[i]%rez[j]==0)
					{gata=1; break;}
			}		
		if(!gata)
		{
			rez[r]=v[i];
			++r;
		}
	}
	printf("%d\n", r-1);
	for(i=1;i<r;++i)
		printf("%d\n", rez[i]);
	return 0;
}