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

lOedgdw, aoedgpn
edg

XqyPjqNZDEK, EfwPjqNgjIP
PjqN

bDhQTqspXznydmjTsAHqB, BNPpXznydmRzkE

pXznydm