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

[Q]: PQCjJwXurLeN, vsjJwXuOy
[A]: jJwXu


[Q]: XHqQIPw, brqQIkAt
[A]: qQI


[Q]: GASqoJ, dTSqXL
[A]:
Sq