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

[Q]: JzbEpAquDJFKcNvEWZxVqRV, PFiJlpAquDJFKcNcqOpMeAv
[A]: pAquDJFKcN


[Q]: UovaYpHjYSQzrfsxRfvIZE, pUOFxIKOGQzrfsxRfvIjrza
[A]: QzrfsxRfvI


[Q]: mJoHBJehHtkFS, ZMrDxHBJehHtxS
[A]:
HBJehHt