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

[Q]: RpaZAvSnEBgGapIPQgw, wcwYsXvSnEBgGapIwoIWROB
[A]: vSnEBgGapI


[Q]: hUpEbyvEcQ, dHpEbyvEvwsXcN
[A]: pEbyvE


[Q]: hGyDyQYdxCCuD, BQiFOyQYdxel
[A]:
yQYdx