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

[EX Q]: HHJAHyvNCGmJEljWrjvHOqf, msPVEbNCGmJEljsKRX
[EX A]: NCGmJElj

[EX Q]: lLxXqKscqizXTO, TqrKscqizutDudo
[EX A]: Kscqiz

[EX Q]: pxiWofTtmIw, CYxnViWofTtuvrzhq
[EX A]:
iWofTt