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

[EX Q]: JKZiYILNeNQbJyznES, PHKILNeNQbJylltYH
[EX A]: ILNeNQbJy

[EX Q]: umXfmRnUgALpFAqBaKfNfo, aOAXWnUgALpFAqBmNpTCdj
[EX A]: nUgALpFAqB

[EX Q]: WyKayoJPK, KaYayoLe
[EX A]:
ayo