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

[Q]: lLxXqKscqizXTO, TqrKscqizutDudo
[A]: Kscqiz


[Q]: OVVkkdeHoFlyNROyCP, zFVUJbvkkdeHoFlysF
[A]: kkdeHoFly


[Q]: rqhQxQQDdYwemFiiwcfVx, cEQDdYwemFtwpfNJC
[A]:
QDdYwemF