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

[Q]: biAihydBoNlzR, IAloNhydBolwUz
[A]: hydBo


[Q]: RtAchtNymcswVk, FWRuRchtNymcswUkoERHyML
[A]: chtNymcsw


[Q]: PlMpZFnSkuvHeNmQjQxY, jSKhRIVCFnSkuvHeNMpEzqS
[A]:
FnSkuvHeN