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

biAihydBoNlzR, IAloNhydBolwUz
hydBo

iYSNsY, HSSNhP
SN

hnTdlsegkkHjAWiJ, rLDvXfAdlsegkkYrDMsik

dlsegkk