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

Q: ljwjMioOwfOltGBaE, TneNGsoOwfOlxnWWW

A: oOwfOl
****
Q: trHTzJpm, aCHTzVVA

A: HTz
****
Q: fffJvDH, CkxfJvUoC

A:
fJv
****