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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
short n,m,x[1025],y[1025],a[1025][1025],sol[1025];
void citire()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>x[i];
for(int j=1;j<=m;j++)
fin>>y[j];
}
void cmlsc()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(x[i]==y[j])a[i][j]=1+a[i-1][j-1];
else a[i][j]=max(a[i-1][j],a[i][j-1]);
}
}
void afis()
{
int l=a[n][m];
fout<<l<<'\n';
int i=n, j=m;
while(l!=0)
{
if(x[i]==y[j])
{
sol[l]=x[i];
l--;j--;i--;
}
else if(a[i-1][j]<a[i][j-1]) j--;
else i--;
}
for(i=1;i<=a[n][m];i++)
fout<<sol[i]<<" ";
}
int main()
{
citire();
cmlsc();
afis();
return 0;
}