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

[Q]: pySBCdpe, AEBCdOR
[A]: BCd


[Q]: MSxTzCpiJAplpzSvLlNJS, oScCpiJAplpNVrqkn
[A]: CpiJAplp


[Q]: yLDBziwYx, FATjDBzibcIh
[A]:
DBzi