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

gXwuhXJrEdzGOmLSKdK, TohXJrEdzGavU
hXJrEdzG

gTjTwC, OUjTgM
jT

pKnDTxAFTqCKlJOWtOaiNNLxJY, CzqCKlJOWtOypwcRO

qCKlJOWtO