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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[1030],b[1030],d[1030][1030],c[1030],k;
int main()
{
fin >> n >> m;
for(int i=1;i<=n;i++)
fin >> a[i];
for(int j=1;j<=m;j++)
fin >> b[j];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(a[i]==b[j]) d[i][j]=d[i-1][j-1]+1;
else d[i][j]=max(d[i][j-1],d[i-1][j]);
}
}
int i=n,j=m;
while(i && j)
{
if(a[i]==b[j])
{
c[++k]=a[i];
i--;
j--;
}
else if(d[i][j-1]>d[i-1][j])
j--;
else i--;
}
fout << k << "\n";
for(int t=k;t>=1;t--)
fout << c[t] << " ";
return 0;
}