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

Q: XSnVeAjWLFWTgwmf, WsByLAjWLFWnQfl

A: AjWLFW
****
Q: zgJGhxLU, EwJGhedW

A: JGh
****
Q: DwnCGbWrVagyPUAAYSVeTLAkbt, RQjagyPUAAYSVvQmXktnd

A:
agyPUAAYSV
****