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]: zRwQdelc, UdAUwQdejhe
[A]: wQde


[Q]: EHPdBNLxPkK, yzsXdBNLfeq
[A]:
dBNL