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

[EX Q]: hCRsCCOoLMpjXwI, lVRCOoLMpxaYFbY
[EX A]: COoLMp

[EX Q]: nXVXIEGP, fkXIEkU
[EX A]: XIE

[EX Q]: YeUvcwOPMp, AXuPyUvcwOWr
[EX A]:
UvcwO