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

TUAHhdvHIBxogI, LjfGsAHhdvHJcSdNV
AHhdvH

yiKkIxbKvNk, znaIxbKggg
IxbK

CqxqjmEEuyaaRgK, affdexqjmEEuyTsFy

xqjmEEuy