In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: BICndZkjoSidWivWATvtqsS, FzVWjoSidWivFaQhkRT

A: joSidWiv
****
Q: KKebLWQCQzVIojj, nxQCQzVIopD

A: QCQzVIo
****
Q: rwZEDNHG, VByEDNlX

A:
EDN
****