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

[Q]: EJZYVxgFxPoOSDlLfK, uTLTIETHZYVxgFxPoPwr
[A]: ZYVxgFxPo


[Q]: vMsEJRoLkWcmkuwNRz, ZmoLkWcmVZiBv
[A]: oLkWcm


[Q]: ddniqu, XDnirM
[A]:
ni