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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[2000],b[2000],d[2000],tata[2000],val[2000];
void afis(int i)
{
if(tata[val[i]]>0)
{
afis(tata[val[i]]);
fout<<b[val[i]]<<" ";
}
else
fout<<b[val[i]]<<" ";
}
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int j=1;j<=m;j++)
fin>>b[j];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
{
if(d[j]<d[j-1]+1)
{
d[j]=d[j-1]+1;
tata[j]=val[j-1];
val[j]=j;
}
}
}
for(int j=1;j<m;j++)
{
if(d[j+1]<d[j])
{
d[j+1]=d[j];
val[j+1]=val[j];
}
}
}
fout<<d[m]<<"\n";
afis(m);
return 0;
}