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

[Q]: FCKbAgSVgj, wAEAWbAgSVSVwD
[A]: bAgSV


[Q]: iJbjApY, ggwbjAws
[A]: bjA


[Q]: JDsGrTQefFDNvYCmH, yxrGrTQefFpG
[A]:
GrTQefF