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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int v[1025][1025],s[1025],a[1025],b[1025],N,M,sir;
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]) v[i][j]=v[i-1][j-1]+1;
else v[i][j]=max(v[i-1][j],v[i][j-1]);
for(int i=M,j=N;i; )
if(a[i]==b[j])
{s[sir++]=a[i];i--;j--;}
else
if(v[i-1][j]<v[i][j-1])
j--;
else
i--;
fout<<sir<<endl;
for(int i=sir-1;i>=0;i--)
fout<<s[i]<<" ";
return 0;
}