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

SOLUTION: XUzpStD

PROBLEM: egYXVtCPvWxP, VMOolyVtCPvWjIx

SOLUTION: VtCPvW

PROBLEM: XyMDByFkkb, IWkNbMDByFkoLa

SOLUTION:
MDByFk