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]: BrDGrTD, PBHDGrDw
[A]: DGr

[Q]: vZOWLhRigWEcDzO, AMAmzzOVLhRigWEcDBT
[A]:
LhRigWEcD