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

[Q]: RGImMTISYdkjzMO, pmyfpImMTISYdatLBBFr
[A]: ImMTISYd


[Q]: CkZOSZevST, bbZOSZIg
[A]: ZOSZ


[Q]: SpNVuiFkCQHBjOESCTqx, yeMMThkCQHBjOEEDLfqO
[A]:
kCQHBjOE


