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