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

SOLUTION: OvLaZ

PROBLEM: FSwxBJ, iTwxAa

SOLUTION: wx

PROBLEM: DlLahJZJQjugmq, YrOfCQLahJZJQjuHpZzgLes

SOLUTION:
LahJZJQju