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

[Q]: nFgMXUzpStDAybiwm, aNJrXUzpStDjp
[A]: XUzpStD


[Q]: CdRbREFMEDTXnEzgn, zHLEMMEDTXnEPH
[A]: MEDTXnE


[Q]: vmBmrjLYGt, XfNtmrjLofY
[A]:
mrjL