#include<bits/stdc++.h>
using namespace std;
ifstream f("economie.in");
ofstream g("economie.out");
int n,v[1002];
bitset<100002>F;
int a[1002],l;
int main()
{
    f>>n;
    for(int i=1;i<=n;++i)
        f>>v[i];
    sort(v+1,v+n+1);
    for(int i=1;i<=n;++i)
        if(F[v[i]]==0)
        {
            for(int j=v[i];j<=50000;j+=v[i])
                F[j]=1;
            for(int j=1;j<=50000;++j)
                if(F[j]==1)
                    F[j+v[i]]=1;
            ++l;
            a[l]=v[i];
        }
    g<<l<<'\n';
    for(int i=1;i<=l;++i)
        g<<a[i]<<" ";
    return 0;
}