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

[Q]: EOacPYivmmUlYenynBqAwx, MoZWMOeXmUlYenynBEendWg
[A]: mUlYenynB


[Q]: RMurrwPjlfG, QBKrrwPDkTM
[A]: rrwP


[Q]: PqekUYInQgLsfTWEz, PzlrYInQgLsfHSAdAlIW
[A]:
YInQgLsf