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

[Q]: mvIvSzMtYsfVLdaGEmef, wnzMtYsfVLdaKm
[A]: zMtYsfVLda


[Q]: rvLoiycpZw, idcvoiycpcLyD
[A]: oiycp


[Q]: CiTNsbepy, DFNsbeZl
[A]:
Nsbe