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

[Q]: MSzHyOuaJILkeY, eUibEHoHyOuaJIhfvXy
[A]: HyOuaJI


[Q]: gwVLygvd, VOQLyglfo
[A]: Lyg


[Q]: MaRYqGdxVXEuddfQh, dSqmGdxVXEjqs
[A]:
GdxVXE