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

Q: HqaOvLaZbs, RifOvLaZkh

A: OvLaZ
****
Q: vFuggVITQuctFG, hdCIWWuuggVITQwr

A: uggVITQ
****
Q: oWwqraAz, uxTqraonu

A:
qra
****