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#include <fstream>
using namespace std;
ifstream fin("pairs.in");
ofstream fout("pairs.out");
int cmmdc(int x, int y)
{ while(x!=y)
if(x>y)
x=x-y;
else y=y-x;
return x;
}
int main()
{
long long m,nr=0,v[1000000];
fin>>m;
for(int i=0;i<m;i++)
{
fin>>v[i];
}
for(int i=0;i<m&&v[i]!=0;i++)
{
for(int j=0;j<m&&j!=i&&v[j]!=0&&v[i]!=0;j++)
{
if(cmmdc(v[i],v[j])==v[i])
{
v[j]==0;
}
if(cmmdc(v[i],v[j])==v[j])
{
v[i]==0;
}
}
}
for(int i=0;i<m;i++)
{
if(v[i]!=0)
nr++;
}
fout<<nr<<endl;
for(int i=0;i<m;i++)
{
if(v[i]!=0)
fout<<v[i]<<endl;
}
return 0;
}