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

Q: FSwxBJ, iTwxAa

A: wx
****
Q: yxJxNRLEnKGHziJtfb, KfReWhEnKGHzitzfPWzK

A: EnKGHzi
****
Q: THMVPmxe, BjdMVPNUA

A:
MVP
****