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

[Q]: KTAFonizDqCVvucpJWrItdw, rfFonizDqCVvYbGhb
[A]: FonizDqCVv

[Q]: zRwQdelc, UdAUwQdejhe
[A]: wQde

[Q]: LXPHFrVfk, qKjHFrPQ
[A]:
HFr