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#include <fstream>
#include <vector>
using namespace std;
int main()
{
ifstream fin("cmlsc.in");
int n,m,a[1030],b[1030];
vector<int> v;
fin>>m>>n;
for(int i=1;i<=m;i++)
fin>>a[i];
for(int i=1;i<=n;i++)
fin>>b[i];
fin.close();
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
{
if(a[i]==b[j]){v.push_back(a[i]);break;}
}
}
ofstream fout("cmlsc.out");
fout<<v.size()<<"\n";
for(int i=0;i<v.size();i++)
fout<<v[i]<<" ";
fout.close();
return 0;
}