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

Q: ftvxfhsnJEygzV, JYxSfhsnJnIqkW

A: fhsnJ
****
Q: CCzKRbuEAmN, qTLzKRbuhEqq

A: zKRbu
****
Q: HVRckDZpNAmtAVDku, YmNjdckDZpNAmtAYheN

A:
ckDZpNAmtA
****