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

Q: KTAFonizDqCVvucpJWrItdw, rfFonizDqCVvYbGhb

A: FonizDqCVv
****
Q: yITbYie, TlqTbYomH

A: TbY
****
Q: nSSmRzjfrUxX, BdWuzjfrUJIFjc

A:
zjfrU
****