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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("econimie.in");
ofstream fout("economie.out");
int n,a[1001],c[1001];
bool b[50000];
int nr;
void citire()
{
b[0]=1;
fin>>n;
for(int i=0;i<n;i++)
{
fin>>a[i];
}
sort(a,a+n);
}
void prelucrare()
{
for(int i=0;i<n;i++)
{if(b[a[i]]==0)
{
c[nr]=a[i];
nr++;
}
for(int j=i;j<a[n-1];j+=a[i])
if(b[j]==1)
{
b[j+a[i]]=1;
}
}
}
int main()
{
citire();
prelucrare();
fout<<nr<<"\n";
for(int i=0;i<nr;i++)
fout<<c[i]<<"\n";
return 0;
}