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#include <string.h>
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int M[1025][1025],m,n,i,j,k=0,x=0,a[100001],b[100001],v[100001];
int main()
{
fin>>m>>n;
for(i=1;i<=m;i++){
fin>>a[i];
}
for(j=1;j<=n;j++){
fin>>b[j];
}
for(int i=1;i<=m;++i){
for(int j=1;j<=n;++j){
if(a[i]==b[j]){
M[i][j]=M[i-1][j-1]+1;
}else{
M[i][j]=max(M[i-1][j],M[i][j-1]);
}
}
}
fout<<M[m][n]<<endl;
while(i>0 && j>0){
if(a[i]==b[j]){
v[k]=a[i];
k++;
i--;j--;
}
else if(M[i-1][j]<M[i][j-1]){
j--;
}
else{i--;}
}
for(i=k-1;i>=1;i--){
fout<<v[i]<<' ';
}
return 0;
}