TASK DEFINITION: In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
PROBLEM: OrcQOvMBhmwP, mnWrzcQOvMBnLwI

SOLUTION: cQOvMB

PROBLEM: CiElmOvTqJGVJkfSaDRzE, EjDJwMyxTvTqJGVJkfluB

SOLUTION: vTqJGVJkf

PROBLEM: jXbgnl, lUbglP

SOLUTION:
bg