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#include <fstream>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int n,m,a[1030],b[1030],x[1030][1030],st[1030],vf;
void citire()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int j=1;j<=m;j++)
fin>>b[j];
}
int maxim(int a ,int b)
{
if(a>b)
return a;
return b;
}
void rezolv()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i] == b[j])
x[i][j] = x[i-1][j-1]+1;
else
x[i][j] = maxim(x[i-1][j],x[i][j-1]);
}
}
void afisare()
{
int i=n,j=m;
while(i!=0&&j!=0)
{
if(a[i]==b[j])
st[++vf]=a[i],i--,j--;
else
if(x[i][j]==x[i-1][j])
i--;
else
j--;
}
fout<<vf<<"\n";
for(int i=vf;i>=1;i--)
fout<<st[i]<<" ";
}
int main()
{
citire();
rezolv();
afisare();
return 0;
}