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

Q: eedZoMwKgDhdsgs, kMMwKgDLm

A: MwKgD
****
Q: HqaOvLaZbs, RifOvLaZkh

A: OvLaZ
****
Q: WQFakPtThiYT, MksRArcFakPtThiCSqW

A:
FakPtThi
****