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

SOLUTION: rrMqWzJSL

PROBLEM: hRVyvwHqnN, geHeyvwHqiBiYJ

SOLUTION: yvwHq

PROBLEM: BzEZJbVSnt, WrvsZZJbVSHUOiM

SOLUTION:
ZJbVS