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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[1030],b[1030],c[1030],k;
int main()
{
fin >> n >> m;
for(int i=1;i<=n;i++)
fin >> a[i];
int pf=1;
for(int j=1;j<=m;j++)
{
int x;
fin >> x;
bool ok=0;
for(int i=pf;i<=n;i++)
{
if(a[i]==x)
{
ok=1;
pf=i;
break;
}
}
if(ok) c[++k]=x;
}
fout << k << "\n";
for(int t=1;t<=k;t++) fout << c[t] << " ";
return 0;
}