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

[Q]: VXSNlHzkB, EoNlHCiL
[A]: NlH


[Q]: QvtDqzQiSknPbRCG, hVxHdqzQiSknPbumdpNIf
[A]: qzQiSknPb


[Q]: bhsjVqWmH, rjdjVqNC
[A]:
jVq