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

[Q]: mOGzbnDXWnNurkBXtcqZ, NLahGzbnDXWnNYgMTOR
[A]: GzbnDXWnN


[Q]: YHLJZrFQ, aSLJZQuo
[A]: LJZ


[Q]: sSypapPOVRntf, rrovgFpapPOVRnCwkVy
[A]:
papPOVRn