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#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int l1,l2,v1[1025]={},v2[1025]={},tab[1025][1025]={},cmlsc[1025]={},lenght=0;
void Read()
{
in>>l1>>l2;
for(int i=1;i<=l1;i++)
in>>v1[i];
for(int i=1;i<=l2;i++)
in>>v2[i];
}
int main()
{
Read();
for(int i=1;i<=l1;i++)
for(int j=1;j<=l2;j++)
if(v1[i]==v2[j])
tab[i][j]=1+tab[i-1][j-1];
else
tab[i][j]=max(tab[i-1][j],tab[i][j-1]);
for(int i=l1,j=l2;i>0,j>0;)
{
if(v1[i]==v2[j])
{
lenght++;
cmlsc[lenght]=v1[i];
i--;
j--;
}
else if(tab[i][j-1]<tab[i-1][j])
i--;
else
j--;
}
out<<lenght<<'\n';
for(int i=lenght;i>0;i--)
out<<cmlsc[i]<<' ';
return 0;
}