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]: VRamNL, mUamIB
[A]: am


[Q]: HIQDFuZKPBImEeDuOcUtlKrgv, HdmBImEeDuOcUlsRg
[A]:
BImEeDuOcU