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

cjDuPZOHjystHnF, okWVdUDuPZOHjSCaEecP
DuPZOHj

mjCEUoPmeKbvCgUtUL, SrHtrPmeKbvYpQAVp
PmeKbv

kcxcHnWEpblxompyz, fxenWEpblxomgJkfX

nWEpblxom