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

Q: JAfPtjqqUYMD, cpXItjqqFN

A: tjqq
****
Q: tftBHoDOYxCoTHVf, qhHoDOYxfUU

A: HoDOYx
****
Q: xtEHBUmEfyvPZONtKWTTalxoX, uqEfyvPZONtwo

A:
EfyvPZONt
****