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

CzkPtkpMTDeNZwCPbJJn, HzpMVDeNZwCPbJVOU
DeNZwCPbJ

BICndZkjoSidWivWATvtqsS, FzVWjoSidWivFaQhkRT
joSidWiv

IOZmqjqrygLns, IQBjqrygLibejt

jqrygL