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

[EX Q]: DFRoMPNDAzNgtLsEPseOzC, qykyPjDAzNgtLsEPYTsNrJaNK
[EX A]: DAzNgtLsEP

[EX Q]: VRamNL, mUamIB
[EX A]: am

[EX Q]: asiAPoOboqSRIhvcKPSMAUWwqs, jCboqSRIhvcKkoeqFN
[EX A]:
boqSRIhvcK