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

[Q]: IVnbnqBqdPcXfHotUzCYoaGQy, PAlyypBRRBqdPcXfHotpZs
[A]: BqdPcXfHot


[Q]: DQVkAbWTTPhoBx, TeWTTPhonxcIKL
[A]: WTTPho


[Q]: avYYbx, jrYYUO
[A]:
YY