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

OUNqomxFcLXhWdfB, gdqomxFcLHQPCu
qomxFcL

iYuUgULgqcAgd, kRNUgULgqFv
UgULgq

kLjMwdttUxkaslDXge, qnMZHgMwdttUxkaCcxmbgj

MwdttUxka