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#include <fstream>
using namespace std;
int n, m, i, j, a[1025], b[1025], v[1025][1025];
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
void afis(int i, int j){
if(v[i][j]!=0){
if(a[i]==b[j]){
afis(i-1, j-1);
fout<<a[i]<<" ";
}
else{
if(v[i-1][j]>v[i][j-1])
afis(i-1, j);
else
afis(i, j-1);
}
}
}
int main(){
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
fin>>b[i];
//v[i][j] = lungimea celui mai lung subsir comun pana la pozitia i din a[] si pozitia j din b[]
for(i=1;i<=n;i++)
for(j=1;j<=m;j++){
if(a[i]==b[j])
v[i][j]=v[i-1][j-1]+1;
else
v[i][j]=max(v[i-1][j], v[i][j-1]);
}
fout<<v[n][m]<<"\n";
afis(n, m);
return 0;
}