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

[Q]: qQkmYsYN, UhkmYHSy
[A]: kmY


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


[Q]: etbdVgSClP, CoVgSCRm
[A]:
VgSC