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

Q: nuwMzarLqoPvabJla, JKcrLqoPvabJNDCILGQ

A: rLqoPvabJ
****
Q: YCAyruPTTHWhCYaiXfIl, OETdzqAyruPTTHWgS

A: AyruPTTHW
****
Q: ecxDnA, CwxDrd

A:
xD
****