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

cjDuPZOHjystHnF, okWVdUDuPZOHjSCaEecP
DuPZOHj

AuSFmN, crSFXM
SF

kSmHVneBAzsxhHDrSe, gSlxeLPQsneBAzsxhHndM

neBAzsxhH