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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int main()
{
int a,b,v[1024],s[1024],con=0;
bool v1[256]={false};
fin>>a>>b;
for (int i=0; i<a; i++)
{
fin>>v[i];
v1[v[i]]=true;
}
for (int i=0; i<b; i++)
{
fin>>s[i];
if (v1[s[i]]==true)
{
con++;
v[con]=s[i];
}
}
fout<<con<<endl;
for (int i=1; i<con; i++)
fout<<v[i]<<" ";
fout<<v[con];
return 0;
}