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

kIBDjQLEZepVNHqnKqhine, hTZepVNHqnYTajyzv
ZepVNHqn

YcgVJVACcQE, JsJVACcSz
JVACc

KMmMIXuGup, DFMIXuGhJcCN

MIXuG