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

Q: AeYjeKwZQillzpD, SnqviKwZQillrxuTB

A: KwZQill
****
Q: mvIvSzMtYsfVLdaGEmef, wnzMtYsfVLdaKm

A: zMtYsfVLda
****
Q: wuEgQKEmDHR, tvIdEgQKEmDyuWZEtk

A:
EgQKEmD
****