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

hUpEbyvEcQ, dHpEbyvEvwsXcN
pEbyvE

NTINFnRckGsfLqhSoA, UUONcKKFnRckGsfLqVak
FnRckGsfLq

DFRoMPNDAzNgtLsEPseOzC, qykyPjDAzNgtLsEPYTsNrJaNK

DAzNgtLsEP