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: bVlwKYBYmcNq, hBlwKYBprL

A: lwKYB
****
Q: xavqeHfHLnIEVDDN, MwEkmcxBvqeHfHLncPJS

A:
vqeHfHLn
****