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

SOLUTION: hmnbhzKRzI

PROBLEM: cUCQXEFSgRZjK, RYdvUQXEFSgRZVlwx

SOLUTION: QXEFSgRZ

PROBLEM: EmPRBLgdEdqCQkqYw, idODkZIgdEdqCQkHtihrb

SOLUTION:
gdEdqCQk