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]: RtOkkgLvhgfGlX, vCOkgLvhzOa
[A]: kgLvh


[Q]: mkCKDiRtoRYEQGnP, ZeosHiRtoRYxPjK
[A]:
iRtoRY


