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