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

[Q]: cxYVucnmEQopeWHrPJ, jNnOaYVucnmEQoSE
[A]: YVucnmEQo


[Q]: AxAmDG, LTAmEV
[A]: Am


[Q]: DDOFNV, BsOFHz
[A]:
OF