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

Q: iUtNuU, iKtNWk

A: tN
****
Q: yhhzISsXKEbA, KlPrazISsXKzmrVBG

A: zISsXK
****
Q: BDRADxVPFUkOfWlaxX, AyPcGTIDxVPFUkOyQSNP

A:
DxVPFUkO
****