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

AeYjeKwZQillzpD, SnqviKwZQillrxuTB
KwZQill

jJSSBmflUyrEMLjSycA, YkmujkSSBmflUyrKKJZ
SSBmflUyr

BnioAXVBpA, EiioAXVjtNgR

ioAXV