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

YRLHFm, odLHCI
LH

sHndIbPaygfNvnquxIHeteW, huLmJWXZIgfNvnquxIViQDhbuoL
gfNvnquxI

LheWTcPamgPzcSaonPHZSPdUHf, HCkRPNPzcSaonPHZfXll

PzcSaonPHZ