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

[Q]: pySBCdpe, AEBCdOR
[A]: BCd


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


[Q]: KwEMwFMDfuaoLQPgS, kawcDfuaoLQhEKchTP
[A]:
DfuaoLQ