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]: JIOKyo, oPOKsX
[A]: OK


[Q]: wmOVOGmmTOtUPboShhG, MzfrEXjmROVOGmmTOtUfUOfnkKER
[A]:
OVOGmmTOtU