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

zBNTHKtofMdHfBgJhOfojzM, VIkVdFapofMdHfBgjPCUo
ofMdHfBg

trHTzJpm, aCHTzVVA
HTz

zmgVAZQGynUGPncOcGqOPoakHADnwv, yVcsVCLryKUGPncOcGqOUDF

UGPncOcGqO

