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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int v[1025][1025],a[1025],b[1025],sir[1025],i,j,m,nr,n;
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(j=1;j<=m;j++)
{
if(a[i]==b[j])
{
v[i][j]=1+v[i-1][j-1];
}
else
v[i][j]=max(v[i-1][j],v[i][j-1]);
}
fout<<v[n][m]<<'\n';
nr=v[n][m];
for(i=2;i<=n;i++)
if(v[i][m]!=v[i-1][m])
fout<<a[i]<<' ';
return 0;
}