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#include<fstream>
using namespace std;
int main ()
{
fstream f("cmlsc.in",ios::in), g("cmlsc.out",ios::out);
short int M,N,A[1024],B,k=0,i,j,nr=0,nrmax[256];
f>>M>>N;
for (i=0;i<M;i++)
{
f>>A[i];
}
for (i=0;i<N;i++)
{
f>>B;
j=k;
while(j<M && B!=A[j])
++j;
if (j<M)
{
nrmax[nr]=B;
++nr;
k=j+1;
}
}
g<<nr<<"\n";
for (i=0;i<nr;i++)
{
g<<nrmax[i]<<" ";
}
return 0;
}