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

[Q]: gHFwDorPbNPORVgdLW, AfqDQvCGFwDorPbNPVPVmbQ
[A]: FwDorPbNP


[Q]: GoodBOwvrki, kRCsdBOwvrakgiH
[A]: dBOwvr


[Q]: RZdNyjiaaW, lcsNyjimc
[A]:
Nyji