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

WlqGjLNrxXeUrKCZel, pDSsmNrxXeUrKCslBXBbRu
NrxXeUrKC

pYmzRnGPQVPrqPApKTyvaO, tNGPQVPrqPVTh
GPQVPrqP

zWXozDvIqVq, tfxozDvIvdSO

ozDvI