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#include<cmath>
#include<fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int m,n,ct,l[1025],d[1025][1025],a[1025],b[1025];
int main(){
fin>>m>>n;
for(int i=1;i<=m;++i)
fin>>a[i];
for(int i=1;i<=n;++i)
fin>>b[i];
for(int i=1;i<=m;++i){
for(int j=1;j<=n;++j){
if(a[i]==b[j]){
d[i][j]=1+d[i-1][j-1];
}
else{
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
}
}
fout<<d[m][n]<<endl;
for(int i=m,j=n;i;){
if(a[i]==b[j])
l[++ct]=a[i],--i,--j;
else if(d[i-1][j]<d[i][j-1])
--j;
else
--i;
}
for(int i=ct;i>0;--i)
fout<<l[i]<<" ";
return 0;
}