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#include <fstream>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int a[1025], b[1025], n, m, i, j, d[1025][1025], lg[1025][1025];
void afisare(int i, int j)
{
if(i>0&&j>0)
if(d[i][j]==1)
{
afisare(i-1, j-1);
fout << a[i] << ' ';
}
else if(d[i][j]==2)
afisare(i-1,j);
else afisare(i, j-1);
}
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])
{
lg[i][j]=1+lg[i-1][j-1];
d[i][j]=1;
}
else if(lg[i][j-1]<lg[i-1][j])
{
lg[i][j]=lg[i-1][j];
d[i][j]=2;
}
else if(lg[i-1][j]<lg[i][j-1])
{
lg[i][j]=lg[i][j-1];
d[i][j]=3;
}
}
fout << lg[n][m] << '\n';
afisare(n, m);
return 0;
}