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

[Q]: PShMbsbexXGlpBuMMDZZS, sVqGxSexXGlpBxuHXoI
[A]: exXGlpB

[Q]: cKsJcqYvZO, UrsJcqBC
[A]: sJcq

[Q]: lVeoqgUziUJmvnnphc, DROtgUziUJmvnnbgPOyHTAt
[A]:
gUziUJmvnn