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: ykDpbd, YFDpmO

A: Dp
****
Q: IsnwYzdunnkAFa, GBQXzdunnRC

A:
zdunn
****