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

Q: FSwxBJ, iTwxAa

A: wx
****
Q: nuwMzarLqoPvabJla, JKcrLqoPvabJNDCILGQ

A: rLqoPvabJ
****
Q: xtnyXn, FPnyEe

A:
ny
****