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

[Q]: WlqGjLNrxXeUrKCZel, pDSsmNrxXeUrKCslBXBbRu
[A]: NrxXeUrKC


[Q]: ztkWLUJQXxP, fYluOkWLUJKDX
[A]: kWLUJ


[Q]: lBmHvWQf, HPmHvnvz
[A]:
mHv