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

IQIHqbEhpVuNATp, GIJIHqbEhpzWb
IHqbEhp

WlqGjLNrxXeUrKCZel, pDSsmNrxXeUrKCslBXBbRu
NrxXeUrKC

uCioSMmfBPiAAppp, gQsmfBPiAAJrMVcrP

mfBPiAA