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

[Q]: kWnjCoVmCSVuW, RILPKCoVmCSVbaOza
[A]: CoVmCSV


[Q]: mmDhYqPJC, qThYqxW
[A]: hYq


[Q]: UmDGYUqLJVfOJiYM, qbQLYUqLJVfNJos
[A]:
YUqLJVf