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