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

[Q]: vFuggVITQuctFG, hdCIWWuuggVITQwr
[A]: uggVITQ


[Q]: uHGHiARtdJbuG, OdZmiARtdrhC
[A]: iARtd


[Q]: qnQNQiRohTnpDjKlDjmKLS, nIFUDoBYRohTnpDjKvUuccY
[A]:
RohTnpDjK