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