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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1025],b[1025],d[1025][1025],sir[1025],dim;
int main()
{
int i,j;
f>>m>>n;
for(i=1;i<=m;i++) f>>a[i];
for(i=1;i<=n;i++) f>>b[i];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i]==b[j])
d[i][j]=1+d[i-1][j-1];
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
i=m;j=n;
for(;i>=1;)
if(a[i]==b[j])
{sir[++dim]=a[i]; i--;j--;}
else if(d[i][j-1]>d[i-1][j]) j--;
else i--;
g<<dim<<'\n';
for(i=dim;i>=1;i--)
g<<sir[i]<<' ';
g<<'\n';
f.close();
g.close();
return 0;
}