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

SOLUTION: YKxPJRXxf

PROBLEM: DwLGzwYOWjtzIunE, TTViSbkwYOWjtzNqUOOz

SOLUTION: wYOWjtz

PROBLEM: JqhOYyigMNosquENmLnc, HTOkWqtnmWgMNosquENmjMJc

SOLUTION:
gMNosquENm