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

DwLGzwYOWjtzIunE, TTViSbkwYOWjtzNqUOOz
wYOWjtz

vSFxjd, AHFxpi
Fx

cDXPsCOSaQWmhUPsID, HHnRJSaQWmhUzBw

SaQWmhU