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

[Q]: tyVlHfTPLRSdFilXnSfqQ, bkTPLRSdFiMgXC
[A]: TPLRSdFi


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


[Q]: UideWVybRXV, BYTYWVybGwbj
[A]:
WVyb