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

Q: iYSNsY, HSSNhP

A: SN
****
Q: BmwpAnWJ, klVwpAFw

A: wpA
****
Q: wjCZbLfnkGobRMFWpJFa, wjrANckGobRMFWEzOrwP

A:
kGobRMFW
****