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

SOLUTION: HhaCEIw

PROBLEM: dZJWBGoeoMepPoTg, pekBGoeoMeQP

SOLUTION: BGoeoMe

PROBLEM: jSAuLgBcj, moOuLgnC

SOLUTION:
uLg