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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,i,p,a[1025],b[1025],mat[1025][1025],x[100001],bb;
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)fin>>a[i];
for(i=1;i<=m;i++)fin>>b[i];
for(i=1;i<=n;i++)
for(p=1;p<=m;p++)
{
if(a[i]==b[p]){mat[i][p]=mat[i-1][p-1]+1;}
else mat[i][p]=max(mat[i-1][p],mat[i][p-1]);
}
for(i=n,p=m;i>0;)
{
if(a[i]==b[p])
{
x[++bb]=a[i];
i--;
p--;
}
else
if (mat[i-1][p]<mat[i][p-1])
p--;
else
i--;
}
fout<<mat[n][m]<<'\n';
for(i=bb;i>0;i--)
fout<<x[i]<<' ';
return 0;
}