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

SOLUTION: GHPDvH

PROBLEM: lkFGXvTkKm, wwELXvTkcOnG

SOLUTION: XvTk

PROBLEM: kidotkqCUqPsCxl, mBxnqCUqPsoO

SOLUTION:
qCUqPs