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

SOLUTION: pEbyvE

PROBLEM: VeLJEBYpZwxVQlo, EZEBYpZwxVQIxjFj

SOLUTION: EBYpZwxVQ

PROBLEM: SUOcHLNaNR, MpcHLNaOTEL

SOLUTION:
cHLNa