In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: RGImMTISYdkjzMO, pmyfpImMTISYdatLBBFr

Answer: ImMTISYd


Question: iJbjApY, ggwbjAws

Answer: bjA


Question: kLcZPfvPS, yzZPfAM

Answer:
ZPf