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

SOLUTION: mRXDUuU

PROBLEM: oWwqraAz, uxTqraonu

SOLUTION: qra

PROBLEM: kxBAsQrsS, cIBAsQUVaz

SOLUTION:
BAsQ