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

RJMYumLAlhmnbhzKRzIOWsGrxGu, VEViqlihmnbhzKRzIBArjAhYrz
hmnbhzKRzI

JAfPtjqqUYMD, cpXItjqqFN
tjqq

YmMtbwXcwPpuYeJnsAjB, bUfobwXcwPpuYdSJ

bwXcwPpuY