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#include <fstream>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int a[1025],b[1025],n,m,i,j,c[1025][1025];
int afisare (int i, int j){
if(i==0 || j==0)
return 0;
else if(a[i]==b[j]){
afisare(i-1,j-1);
fout<<a[i]<<" ";
}
else if(c[i-1][j]>c[i][j-1])
afisare(i-1,j);
else afisare(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];
for(i=1;i<=n;i++){
for(j=1;j<=m;j++){
if(a[i]!=b[j])
if(c[i-1][j]>c[i][j-1])
c[i][j]=c[i-1][j];
else
c[i][j]=c[i][j-1];
else
c[i][j]=c[i-1][j-1]+1;
}
}
fout<<c[n][m]<<"\n";
afisare(n,m);
}