#include<stdio.h>
#include<algorithm>
using namespace std;
int v[1005],sol[1005];
int main()
{
    int N,nr=0;
    freopen("economie.in","r",stdin);
    freopen("economie.out","w",stdout);
    scanf("%d",&N);
    for(int i=1;i<=N;++i)
        scanf("%d",&v[i]);
    sort(v+1,v+1+N);
    sol[++nr]=v[1];
    for(int i=2;i<=N;++i){
        int j;
        for(j=1;v[i]%sol[j] && j<=nr;j++);
        if(j>nr) sol[++nr]=v[i];
    }
    printf("%d\n",nr);
    for(int i=1;i<=nr;++i)
        printf("%d\n",sol[i]);
    fclose(stdin);fclose(stdout);
    return 0;
}