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

SOLUTION: EAUfW

PROBLEM: HLtkkRnWkgIdqbQH, dWeFUtkkRnWkgIdZhlQh

SOLUTION: tkkRnWkgId

PROBLEM: somQfpsHXqLZBgYCCBEnaz, OfxJdeZXqLZBgYCCveWsBSz

SOLUTION:
XqLZBgYCC