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

SOLUTION: ZdkzK

PROBLEM: zgJGhxLU, EwJGhedW

SOLUTION: JGh

PROBLEM: OYERnjubLFovtcS, FngzQJVGERnjubLFafmzq

SOLUTION:
ERnjubLF