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

Q: UZbmGVDzIaf, qfHwqGVDzIsd

A: GVDzI
****
Q: ezVsFayUPcrte, lfsFayUMPTqx

A: sFayU
****
Q: AtOyOCbMhaE, UOvWOyOCbMYFeVl

A:
OyOCbM
****