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

kIBDjQLEZepVNHqnKqhine, hTZepVNHqnYTajyzv
ZepVNHqn

FCKbAgSVgj, wAEAWbAgSVSVwD
bAgSV

jXNYInwKxYgmOsdLT, NuVpvZFqeNYInwKxYgmLezGaSOnz

NYInwKxYgm