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

[Q]: kUoqCMPFTqGE, guoqCMPkwJs
[A]: oqCMP


[Q]: QlJnxO, BLJnCQ
[A]: Jn


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