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

dlzequypR, Puequqv
equ

eNuawupVqQ, RIawuplUIf
awup

upMDVCiSAMHBdGF, dkVCiSAMHBJaGahBsC

VCiSAMHB