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

[Q]: ljwjMioOwfOltGBaE, TneNGsoOwfOlxnWWW
[A]: oOwfOl


[Q]: zqRbqwgmqGIAGTeeoGFOSr, RFnLqwgmqGIAGLcEvAWxY
[A]: qwgmqGIAG


[Q]: YpLhcdrCHrryq, cKLhcdrCHPPiSX
[A]:
LhcdrCH