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

Q: andNlOdIcQMyZvc, vCMENolkslOdIcQMyZJtCFo

A: lOdIcQMyZ
****
Q: wLLwjL, arLwXm

A: Lw
****
Q: rPPfxUdowLLdvwRtY, PuHovApkfxUdowLLBOhq

A:
fxUdowLL
****