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

Q: mXHhaCEIwqwEZcz, JZPXbYHhaCEIwZmna

A: HhaCEIw
****
Q: oCtWZYdkvZ, pkktWZYdEHMW

A: tWZYd
****
Q: wNiHcaiUPHnjp, aSTmjcaiUPHFzOu

A:
caiUPH
****