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

Q: CxwZWv, mkwZgM

A: wZ
****
Q: RAmKlEAUfWcgF, ZlWfEAUfWvVRa

A: EAUfW
****
Q: WZVPZNMVE, NKVPZNMap

A:
VPZNM
****