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

[Q]: lPhVhAQZWJDrvzcEaGEwKgZAuJI, qIJDrvzcEaGDRCRrB
[A]: JDrvzcEaG


[Q]: dZJWBGoeoMepPoTg, pekBGoeoMeQP
[A]: BGoeoMe


[Q]: WyxRZr, LDxRWK
[A]:
xR