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

[Q]: pBDnbfrAxJfVhPBxheXZGp, LMtorAxJfVhPnnaed
[A]: rAxJfVhP


[Q]: bmsrkXGb, GcarkXOZF
[A]: rkX


[Q]: JHBWQatTOtwmBcnIcfatar, zYgKatTOtwmBchNhoJy
[A]:
atTOtwmBc