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

[Q]: HqaOvLaZbs, RifOvLaZkh
[A]: OvLaZ


[Q]: pJqqIW, Ivqqxw
[A]: qq


[Q]: cTUaQXMikjvaVmTEiZS, xElCikjvaVmThasDsl
[A]:
ikjvaVmT