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

[Q]: oHoJrr, YAoJSq
[A]: oJ


[Q]: ptVlCwpfOZIi, QEdyVlCwpfOwp
[A]: VlCwpfO


[Q]: SLKOiVwoAUMvLIyAQcILhq, TwWDgjrOiVwoAUMvLfMKQ
[A]:
OiVwoAUMvL