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

RJMYumLAlhmnbhzKRzIOWsGrxGu, VEViqlihmnbhzKRzIBArjAhYrz
hmnbhzKRzI

dsngGP, KvnglB
ng

ZSVZIwIjwVSwnsny, YjvXnIjwVSwKVXmrw

IjwVSw