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

[Q]: CiElmOvTqJGVJkfSaDRzE, EjDJwMyxTvTqJGVJkfluB
[A]: vTqJGVJkf


[Q]: HiGmCdXrmFRJYWLvZbpU, IxhkrmFRJYWLvZLaqRVxPkL
[A]: rmFRJYWLvZ


[Q]: rHOaxRMVrpW, MVmYxRMVvu
[A]:
xRMV