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

[Q]: HhBhJMpxpty, MxTJMpxnQEf
[A]: JMpx


[Q]: vMsEJRoLkWcmkuwNRz, ZmoLkWcmVZiBv
[A]: oLkWcm


[Q]: SIeeQWVwBCCugliWp, uIMyTeeQWVwBCpqmqhswJ
[A]:
eeQWVwBC