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

Q: trHTzJpm, aCHTzVVA

A: HTz
****
Q: XqyPjqNZDEK, EfwPjqNgjIP

A: PjqN
****
Q: xCBwwexVR, jNorBwwefhz

A:
Bwwe
****