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