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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1025], b[1025],m,n,nr,lcs[1025],k;
int main()
{
fin>>m>>n;
for(int i=1;i<=m;i++) fin>>a[i];
for(int i=1;i<=n;i++) fin>>b[i];
k=1;
for(int i=1;i<=n;i++)
{
for(int j=k;j<=m;j++)
if(b[i]==a[j])
{
lcs[++nr]=b[i];
k=j;
break;
}
}
fout<<nr<<'\n';
for(int i=1;i<=nr;i++) fout<<lcs[i]<<" ";
return 0;
}