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

biAihydBoNlzR, IAloNhydBolwUz
hydBo

txJhzNeBj, qLJhzNesV
JhzNe

TRSfMmoDMFVCm, HuMmoDMFGvXO

MmoDMF