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

[Q]: pIkAtJHVcvzzZVz, btWerNSHVcvzzZTz
[A]: HVcvzzZ


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


[Q]: DkhKrEAFBmIvyaZ, dyCkUeKrEAFBNJAw
[A]:
KrEAFB