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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int M,N,vM[1024],vN[1024],a[1024][1024],k[1024],nr,MAX;
int main()
{
fin>>M>>N;
for(int i=1;i<=M;i++)fin>>vM[i];
for(int i=1;i<=N;i++)fin>>vN[i];
for(int i=1;i<=M;i++)
for(int j=1;j<=N;j++)
{
if(vM[i]==vN[j])
{
a[i][j]=a[i-1][j-1]+1;
k[nr++]=vM[i];
}
else a[i][j] = max(a[i-1][j],a[i][j-1]);
}
MAX=a[M][N];
fout<<MAX<<'\n';
for(int i=0;i<nr;i++)fout<<k[i]<<" ";
fin.close();
fout.close();
return 0;
}