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

SOLUTION: GzbnDXWnN

PROBLEM: sGrHRmELarByxp, cDCUnmELarBXbEfM

SOLUTION: mELarB

PROBLEM: npqkkUADzwDs, LmUkUADLmQP

SOLUTION:
kUAD