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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("economie.in");
ofstream g("economie.out");
int i,j,viz[1002],v[1002],sol[1002],k,n;
int main()
{
f>>n;
for(i=1;i<=n;i++)
{
f>>v[i];
}
sort(v+1,v+n+1);
for(i=1;i<=n;i++)
{
if(viz[i]==0)
{
viz[i]=1;
sol[++k]=i;
for(j=i+1;j<=n;j++)
if(v[j]%v[i]==0)
viz[j]=1;
}
}
g<<k<<'\n';
for(i=1;i<=k;i++)
g<<sol[i]<<'\n';
return 0;
}