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]: sRTQgRgRUjEooapKdR, vzsBgRUjEooLBkYeH
[A]: gRUjEoo


[Q]: cuvmWB, invmQF
[A]:
vm