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

[Q]: rduIwWNGM, AJqYIwWNaCap
[A]: IwWN


[Q]: gfDDsblwUryUw, UWaRisblwUTqTM
[A]: sblwU


[Q]: YKzNrLBLmBLd, MNqRrLBLvC
[A]:
rLBL