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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[1026],b[1025],L[1025][1025],P[1025][1025],l;
void citire()
{
int i,j;
fin>>n>>m;
for(i=1; i<=n; i++)
fin>>a[i];
for(j=1; j<=m; j++)
fin>>b[j];
}
void constr_matrice()
{
int i,j;
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
if(a[i]==b[j])
{
L[i][j]=L[i-1][j-1]+1;
P[i][j]=1; l++;
}
else if(L[i-1][j]>L[i][j-1])
{
L[i][j]=L[i-1][j];
P[i][j]=2;
}
else
{
L[i][j]=L[i][j-1];
P[i][j]=3;
}
}
void afisare(int i,int j)
{
if(i>0 && j>0)
if(P[i][j]==1)
{
afisare(i-1,j-1);
l++;
//c[j]=b[j];
fout<<a[i]<<' ';
}
else if(P[i][j]==2)
{
//l++;
afisare(i-1,j);
}
else
{
//l++;
afisare(i,j-1);
}
}
int main()
{
citire();
constr_matrice();
fout<<l<<'\n';
afisare(n,m);
//for(int i=1;i<=l;i++)
//fout<<c[i]<<' ';
return 0;
}