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

[Q]: wlFcxOHoXC, IWFcxOIWTk
[A]: FcxO


[Q]: QEEVsnbQIgrxaZmflaZ, dPSbljkdQIgrxaZmgVzMT
[A]: QIgrxaZm


[Q]: ggPlLhrVElswG, ZuuPlLhrVElsNjmjR
[A]:
PlLhrVEls