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#include <fstream>
#define NMAX 1024
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,x[NMAX],y[NMAX],a[NMAX][NMAX];
void citire()
{
int i;
f>>m>>n;
for(i=1;i<=m;i++) f>>x[i];
for(i=1;i<=n;i++) f>>y[i];
}
void dinamica()
{
int i,j;
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(x[i]==y[j])
a[i][j]=a[i-1][j-1]+1;
else
a[i][j]=max(a[i-1][j],a[i][j-1]);
}
void afisare(int i, int j)
{
if(a[i][j])
if(x[i]==y[j])
afisare(i-1,j-1), g<<x[i]<<" ";
else
if(a[i][j]==a[i-1][j])
afisare(i-1,j);
else
afisare(i,j-1);
}
int main()
{
citire();
dinamica();
g<<a[m][n]<<endl;
afisare(m,n);
return 0;
}