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

WlqGjLNrxXeUrKCZel, pDSsmNrxXeUrKCslBXBbRu
NrxXeUrKC

lsNwypFwhKP, diEfLwypFwEKqCN
wypFw

dFIXDqmdU, slXDqmNJNd

XDqm