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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int i,j,x[1025],y[1025],n,m,a[1025],k,nr;
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>x[i];
for(j=1;j<=m;j++)
fin>>y[j];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(x[i]==y[j]) {
nr++;
k++;
a[k]=x[i];
}
fout<<nr<<'\n';
for(k=1;k<=nr;k++)
fout<<a[k]<<" ";
return 0;
}