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

cjDuPZOHjystHnF, okWVdUDuPZOHjSCaEecP
DuPZOHj

kyADtWLlnmYv, tcaKvDtWLlnvBq
DtWLln

dCwRSmJCyYzRvL, GwSmJCyYhLP

SmJCyY