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#include <iostream>
#include <fstream>
using namespace std;
int main()
{ int m,n,i,j,k;
long a[1025], b[1025],v[1025];
fstream f("cmlsc.in",ios::in);
fstream g("cmlsc.out",ios::out);
f>>m>>n;
for(i=1;i<=m;i++) f>>a[i];
for(i=1;i<=n;i++) f>>b[i];
k=0;
for(i=1;i<=m;i++){ for(j=1;j<=n;j++)
if(a[i]==b[j]&&v[k-1]!=a[i]) { k++; v[k]=a[i]; }
}
g<<k<<endl;
for(i=1;i<=k;i++)
g<<v[i]<<" ";
f.close();
g.close();
return 0;
}