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

[EX Q]: GFhJafTV, waHhJaji
[EX A]: hJa

[EX Q]: bUcuzFgsdfojVR, IdcuzFgsdMRgtMA
[EX A]: cuzFgsd

[EX Q]: VVsQGHSNzhItKaBEDbHYvO, OxpqEXxItKaBEDbHYrBwXk
[EX A]:
ItKaBEDbHY