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/**
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///* economie * isi cere drepturile inapoi! dariusbandila17 de pe pbinfo/infoarena i-a furat prestigiul!
**/
#include <bits/stdc++.h>
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
int f[50005],n,a[1005];
vector<int> v;
void sortare(){sort(a+1,a+n+1);}
int main(){
int ans=0;
fin >> n;
for(int i=1;i<=n;i++)fin>>a[i];
int maxi=a[n];
sortare();
for(int i=1;i<=n;i++){
if(f[a[i]]==0){
v.push_back(a[i]);
f[a[i]]=1;
for(int j=1;j*a[i]<=maxi;j++){
f[a[i]*j]=1;
}
}
}
fout << v.size() << '\n';
for(int i=0;i<v.size();i++)fout<<v[i]<< ' ';
}