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

JIOKyo, oPOKsX
OK

GoodBOwvrki, kRCsdBOwvrakgiH
dBOwvr

HJetceejJkjxeMNgJOGcm, wQDBqWDtceejJkjxqjplmMNzM

tceejJkjx

