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

Q: TUAHhdvHIBxogI, LjfGsAHhdvHJcSdNV

A: AHhdvH
****
Q: SeXNqRAbKdLuWXgb, npsIWRAbKdLuUWSbvuS

A: RAbKdLu
****
Q: FbJRkJlf, iwuJRkOw

A:
JRk
****