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

[Q]: TnbLNKnNSs, NhDLNKnNRd
[A]: LNKnN


[Q]: XYnCjAWPHHJ, gmCjAWPHpmwVsm
[A]: CjAWPH


[Q]: xvatqreu, QsQatqiQJ
[A]:
atq