In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: OBzHWjmkcgVGPyv, gCHWjmkcgVMq

Answer: HWjmkcgV


Question: cjDuPZOHjystHnF, okWVdUDuPZOHjSCaEecP

Answer: DuPZOHj


Question: jaKdhfbuBrmjjQKVBFnTglc, tREtBrmjjQKVBzpEJ

Answer:
BrmjjQKVB