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

JKZiYILNeNQbJyznES, PHKILNeNQbJylltYH
ILNeNQbJy

DwLGzwYOWjtzIunE, TTViSbkwYOWjtzNqUOOz
wYOWjtz

fGZFPsOMzIx, VKNbFPsOMBCY

FPsOM