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

HaLZdTX, tLLZdEXN
LZd

HKqfdEvqDuGhWByFlzIEeYh, VVaZfkLCMuGhWByFlzIOZaXbMCA
uGhWByFlzI

lOedgdw, aoedgpn

edg