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

SOLUTION: tjqq

PROBLEM: YRLHFm, odLHCI

SOLUTION: LH

PROBLEM: xJJAZQQvGKyM, XnKQHAZQQvGKcjIQ

SOLUTION:
AZQQvGK