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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int A[1025],B[1025],mat[1025][1025],v[1025];
int main()
{
int n,m,lmax=-1;
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>A[i];
for(int i=1;i<=m;i++)
{fin>>B[i];}
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
int y=0;
if(A[i]==B[j])
{
if(y==0)
mat[i][j]=mat[i-1][j-1]+1,y=1;
else
mat[i][j]=max(mat[i-1][j],mat[i][j-1])+1;
int stp=mat[i][j];
if((lmax==-1)||(lmax!=-1&&stp>=lmax))
{
v[stp]=A[i];
lmax=stp;
}
}
else
mat[i][j]=max(mat[i][j-1],mat[i-1][j]);
}
fout<<mat[n][m]<<'\n';
for(int i=1;i<=mat[n][m];i++)
fout<<v[i]<<' ';
}