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

[Q]: GoodBOwvrki, kRCsdBOwvrakgiH
[A]: dBOwvr


[Q]: ZKMRTxCxbsbX, iovHrMRTxCxbsjv
[A]: MRTxCxbs


[Q]: mkRlgPkFoZcmEPjr, iVPkFoZcmHAxO
[A]:
PkFoZcm