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

Q: KKrCLvJKRoyV, WDeLvJKCBdS

A: LvJK
****
Q: ZyrpGdXvvtrKQIxU, CLNGdXvvtrKQDpicfqLdt

A: GdXvvtrKQ
****
Q: zyQeXrFCbjcjFmKIYSZ, iiaMbjcjFmKIQnW

A:
bjcjFmKI
****