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

YcgVJVACcQE, JsJVACcSz
JVACc

kOrQWjLKnwN, xFsWjLKgr
WjLK

htqbIdDxCXS, iXIdDxCZOw

IdDxC