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

GoodBOwvrki, kRCsdBOwvrakgiH
dBOwvr

rcKVmDzwJKeK, uYqmDzwJKxkGi
mDzwJK

dNqPlMQZsuEyZlmouOu, LHpuNnlMQZsuEyXUh

lMQZsuEy