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

Q: yhhzISsXKEbA, KlPrazISsXKzmrVBG

A: zISsXK
****
Q: DUhUbmfLuOFAQann, kwnzfLuOFAErR

A: fLuOFA
****
Q: ksdKTll, SwudKTuAV

A:
dKT
****