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

gTjTwC, OUjTgM
jT

rvLoiycpZw, idcvoiycpcLyD
oiycp

BCveYTUwyscBCqNG, whZqtdoeYTUwysdLNpew

eYTUwys