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

[Q]: wXGerDNhSNnCCedyzskswVnh, BfFNhSNnCCedybrUbI
[A]: NhSNnCCedy


[Q]: cKsJcqYvZO, UrsJcqBC
[A]: sJcq


[Q]: UTfRLeHmZSyhvqmZ, jWlNRuLeHmZSyhvXqfPIwV
[A]:
LeHmZSyhv