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