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

[Q]: DwLGzwYOWjtzIunE, TTViSbkwYOWjtzNqUOOz
[A]: wYOWjtz


[Q]: iupYjFXrrMqWzJSLUSwmEukHc, hqajjWrrMqWzJSLnF
[A]: rrMqWzJSL


[Q]: PSLmLr, YMLmOG
[A]:
Lm