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]: uqDaPS, XyDaMZ
[A]: Da


[Q]: NxgzLSzFGa, JvLzLSzsuj
[A]:
zLSz