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

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

[EX Q]: uqDaPS, XyDaMZ
[EX A]: Da

[EX Q]: uWuoSU, MTuoik
[EX A]:
uo