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: mXHhaCEIwqwEZcz, JZPXbYHhaCEIwZmna

SOLUTION: HhaCEIw

PROBLEM: flOrRMSTeYHQQHqUighj, stUygVeYHQQHqUiUAts

SOLUTION:
eYHQQHqUi