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

[Q]: bSBuJiZniSlZtO, AcuJiZniSRAOAv
[A]: uJiZniS


[Q]: GoodBOwvrki, kRCsdBOwvrakgiH
[A]: dBOwvr


[Q]: tQjksiCMJjewpHVvWM, XiJknFfMjksiCMJjVdLIKNl
[A]:
jksiCMJj