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#include <fstream>
#define NMAX 1029
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[NMAX],b[NMAX];
int LCS[NMAX][NMAX];
void citire();
void pd();
void afisare();
int main()
{
citire();
pd();
afisare();
return 0;
}
void afisare()
{
int i,j;
fout << LCS[1][1] << '\n';
i=1;j=1;
while(i!=n+1 && j!=m+1)
{
if(a[i]==b[j])
{
fout << a[i] << ' ';
i++;
j++;
}
else
{
if(LCS[i][j]==LCS[i+1][j])
i++;
else j++;
}
}
fout << '\n';
}
void citire()
{
int i;
fin >> n >> m;
for(i=1;i<=n;i++)
fin >> a[i];
for(i=1;i<=m;i++)
fin >> b[i];
}
void pd()
{
int i,j;
for(i=n;i>0;i--)
for(j=m;j>0;j--)
if(a[i]==b[j])
LCS[i][j]=1+LCS[i+1][j+1];
else
if(LCS[i][j+1]> LCS[i+1][j])
LCS[i][j]=LCS[i][j+1];
else
LCS[i][j]=LCS[i+1][j];
}