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

SOLUTION: lwKYB

PROBLEM: wLLwjL, arLwXm

SOLUTION: Lw

PROBLEM: DthdWkes, irJdWkFph

SOLUTION:
dWk