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

SOLUTION: BuMdiZ

PROBLEM: LJJvLTK, jpFJvLqh

SOLUTION: JvL

PROBLEM: MNRwzXwkMqKW, fLkhARwzXwkMqnCqmtoE

SOLUTION:
RwzXwkMq