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

[Q]: OXdSmcKG, XbDdSmJl
[A]: dSm


[Q]: BpGFyhLez, DfFyhuJY
[A]: Fyh


[Q]: BBNxPyaSwT, OZhAxPyagQ
[A]:
xPya