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

[Q]: plSfJAktMfac, TCjYJAktlt
[A]: JAkt


[Q]: gfDDsblwUryUw, UWaRisblwUTqTM
[A]: sblwU


[Q]: WIBTrEytmXUHGZmzP, DioXCUtmXUHGZKDZdF
[A]:
tmXUHGZ