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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[257],b[257],c[513];
int main()
{
int n,m,i,j,nu=0,nr=0,k=1;
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(j=1;j<=m;j++)
f>>b[j];
for(i=1;i<=n;i++)
for(j=nu+1;j<=m;j++)
if(a[i]==b[j])
{
nr++;
c[k++]=a[i];
nu=i;
}
g<<nr<<"\n";
for(i=1;i<k;i++)
g<<c[i]<<" ";
f.close();
g.close();
return 0;
}