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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1025], b[1025],c[1025],i,j,maxi,n,m,p,r;
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
fin>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(a[i]==b[j] && maxi<=j)
{
p++;
c[p]=a[i];
r++;
maxi=j;
}
}
fout<<r<<'\n';
for(i=1;i<=p;i++)
fout<<c[i]<<" ";
return 0;
}