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

Q: oiNEYHxbvAb, bcDDdEYHxbCREd

A: EYHxb
****
Q: slTUxy, oqTUYa

A: TU
****
Q: ABTUntXnuvquyLnJjEm, oTnuvquyLaH

A:
nuvquyL
****