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

kIBDjQLEZepVNHqnKqhine, hTZepVNHqnYTajyzv
ZepVNHqn

bjjsMtBzzXIgYWPBZmaDL, iTxktmvBzzXIgYWPhbAyBE
BzzXIgYWP

aSoScLynKlvhqHhycOYKAu, zxWbMInKlvhqHhycmxsmAXDp

nKlvhqHhyc