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

JKZiYILNeNQbJyznES, PHKILNeNQbJylltYH
ILNeNQbJy

OyXwTWbLByC, yODnTWbLWYzc
TWbL

wdzkBHsiDxqcYmq, pXFLUAokBHsiDxqcsSy

kBHsiDxqc