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

[Q]: euQWhCovKplukMYznXcD, XAfMhKdzhCovKplukMcMlSuBw
[A]: hCovKplukM


[Q]: OUNqomxFcLXhWdfB, gdqomxFcLHQPCu
[A]: qomxFcL


[Q]: oEPptUypVxRLnWzZEz, OJypVxRLnWsZ
[A]:
ypVxRLnW