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#include <fstream>
using namespace std;
int a[1025], b[1025], c[1025];
int main()
{
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,i,j,p=0;
fin>>n>>m;
for (i=1; i<=n; i++)
fin>>a[i];
for (j=1; j<=m; j++)
fin>>b[j];
for (i=1; i<=n; i++)
for (j=1; j<=m; j++)
if(a[i]==b[j])
c[++p]=a[i];
fout<<p<<endl;
for (i=1; i<=p; i++)
fout<<c[i]<<" ";
}