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]: nFgMXUzpStDAybiwm, aNJrXUzpStDjp
[A]: XUzpStD


[Q]: BUIaYvVDAxbcxDPF, PWYvVDAxoVqFm
[A]:
YvVDAx