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

[Q]: SUueHhzGsanfsalEEc, KygEhzGsanfsapbKKX
[A]: hzGsanfsa


[Q]: JzbEpAquDJFKcNvEWZxVqRV, PFiJlpAquDJFKcNcqOpMeAv
[A]: pAquDJFKcN


[Q]: HSLrtrekbHBIH, CdtrekbHBmtjMlGh
[A]:
trekbHB


