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

Q: feYKRk, PrYKMW

A: YK
****
Q: TnbLNKnNSs, NhDLNKnNRd

A: LNKnN
****
Q: JKZiYILNeNQbJyznES, PHKILNeNQbJylltYH

A:
ILNeNQbJy
****