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

xzMUdHcoYJFWLOILjrg, vCscoYJFWLzO
coYJFWL

YKpdeJQhzyYiPoODACUu, mjmnIlCehzyYiPoOzZ
hzyYiPoO

ocobPwM, DRobPdRy

obP