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

SOLUTION: JMpx

PROBLEM: lkFGXvTkKm, wwELXvTkcOnG

SOLUTION: XvTk

PROBLEM: vkRGZqWTmY, whZqWTAk

SOLUTION:
ZqWT