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