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