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

VpJvIZdkzKovjc, BZEizZdkzKYZ
ZdkzK

hUpEbyvEcQ, dHpEbyvEvwsXcN
pEbyvE

UbsOamc, sesOatA

sOa