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

aIZIsqL, wxSZIsEnO
ZIs

nhGinCtvLartcMPhJwGRbpZNrq, iQJlFKayEartcMPhJwDRROB
artcMPhJw

cyJmRJuaNgMxqfwFyRfCU, JaafVAbReJuaNgMxqfml

JuaNgMxqf