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

Q: OezHeoe, ouUzHemU

A: zHe
****
Q: YCAyruPTTHWhCYaiXfIl, OETdzqAyruPTTHWgS

A: AyruPTTHW
****
Q: TwyIYxtzg, lslZyIYxoX

A:
yIYx
****