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

SOLUTION: JWQbzEZk

PROBLEM: OYERnjubLFovtcS, FngzQJVGERnjubLFafmzq

SOLUTION: ERnjubLF

PROBLEM: VjLRnxiZgCUStl, hsFLRnxiZKwNml

SOLUTION:
LRnxiZ