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

Q: uqDaPS, XyDaMZ

A: Da
****
Q: trHTzJpm, aCHTzVVA

A: HTz
****
Q: jmUvdzyaewvKNKqV, vkiUvdzyaemmsLA

A:
Uvdzyae
****