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

[Q]: gHFwDorPbNPORVgdLW, AfqDQvCGFwDorPbNPVPVmbQ
[A]: FwDorPbNP


[Q]: ZyrpGdXvvtrKQIxU, CLNGdXvvtrKQDpicfqLdt
[A]: GdXvvtrKQ


[Q]: kYCftmRbrTOlRI, EWmRbrTORPG
[A]:
mRbrTO