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]: hUpEbyvEcQ, dHpEbyvEvwsXcN
[A]: pEbyvE


[Q]: EOSNwDAvXKkjbBPegufcw, WzKkjbBPeguflPWdParwj
[A]:
KkjbBPeguf