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

nxTtNYaazlOyEBApiUSJS, BLazlOyEBCV
azlOyEB

cjDuPZOHjystHnF, okWVdUDuPZOHjSCaEecP
DuPZOHj

uJPYkloyplNUIbxRK, spnrPfyplNUIbMlK

yplNUIb