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

zqwhMdAdXQfQCAmVNaYZm, toYMIwQeadAdXQfQCAmLyheFOv
dAdXQfQCAm

sHndIbPaygfNvnquxIHeteW, huLmJWXZIgfNvnquxIViQDhbuoL
gfNvnquxI

RiCGIJ, WdCGnj

CG