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

SOLUTION: nbUQRpi

PROBLEM: nFgMXUzpStDAybiwm, aNJrXUzpStDjp

SOLUTION: XUzpStD

PROBLEM: ickjsXXHOjkXGTE, jrcztkjsXXHOjkqSrnIwv

SOLUTION:
kjsXXHOjk