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

[Q]: NTINFnRckGsfLqhSoA, UUONcKKFnRckGsfLqVak
[A]: FnRckGsfLq


[Q]: apGMPThLTCw, LvMPThYW
[A]: MPTh


[Q]: ioSFihYnW, vgFihYwk
[A]:
FihY