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

Answer: MXjGMNi


Question: XpFCxFOgTTNCnQzMnVPV, FMqzdOwgTTNCnQzedorxVPe

Answer: gTTNCnQz


Question: BWCztYsTPqXktZbqFZ, hSgBgcYsTPqXkNsP

Answer:
YsTPqXk