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

Q: dxqZUOvRprXyFfjQfTWBhR, biSVjOvRprXyFfDtuFWQ

A: OvRprXyFf
****
Q: rqhQxQQDdYwemFiiwcfVx, cEQDdYwemFtwpfNJC

A: QDdYwemF
****
Q: wkwhSBtWeheuJd, AHboBtWeheuKRvhNA

A:
BtWeheu
****