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

[Q]: zBxuZfJgYrlRSzkmAktO, YNMgYrlRSzklmBOH
[A]: gYrlRSzk


[Q]: BeEgLISxThm, UGLISxEtP
[A]: LISx


[Q]: meAdUWVGllDWrK, mfOUWVGllDWWY
[A]:
UWVGllDW