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#include <fstream>
#include <cmath>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int a[1025], b[1025], c[1025][1025], d[1024];
int main()
{
int m, n, k=0;
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int i=1;i<=m;i++)
fin>>b[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=n;j++)
{
if(a[i]==b[j])
c[i][j]=c[i-1][j-1]+1;
else
c[i][j]=max(c[i-1][j],c[i][j-1]);
}
int i=n, j=m;
while(i!=0 or j!=0)
{
if(a[i]==b[j])
{
d[++k]=a[i];
i--;
j--;
}
else if(c[i-1][j]<c[i][j-1])
j--;
else
i--;
}
fout<<k<<'\n';
for(int l=k;l>0;l--)
fout<<d[l]<<' ';
return 0;
}