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

Q: HorIyjpfBFmKZQUIEoP, AcWOaOgVPmyjpfBFmKZQPFYiI

A: yjpfBFmKZQ
****
Q: FNVeaFmprNHqqtAaKv, iGBmrrMveaFmprNHqWWAvtht

A: eaFmprNHq
****
Q: orurdQExLSZetR, mZOnxQExLSZkNkI

A:
QExLSZ
****