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

[Q]: wkVVZREWhcSCpvCTB, ZQWhcSCpvCDVUY
[A]: WhcSCpvC


[Q]: eeoJEtGHPDvHck, ezPGHPDvHSf
[A]: GHPDvH


[Q]: JdiUUQagCSoSX, fOUPiUQagCiHhsS
[A]:
UQagC