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#include <fstream>
#define nmax 1200
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[nmax],b[nmax],c[nmax][nmax];
void afis(int l,int cl)
{
if(c==0||l==0)
return;
if(a[l]==b[cl])
{
afis(l-1,cl-1);
fout<<a[l]<<" ";
}
else
if(c[l][cl-1]>c[l-1][cl])
afis(l,cl-1);
else
afis(l-1,cl);
}
int main()
{
int n,m;
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])
c[i][j]=c[i-1][j-1]+1;
else
c[i][j]=max(c[i-1][j],c[i][j-1]);
fout<<c[n][m]<<"\n";
afis(n,m);
return 0;
}