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

SOLUTION: NLBbwC

PROBLEM: krnkpodgfpCKtfCqyzUbymWbxi, DydgSWpCKtfCqyzDaMsjqc

SOLUTION: pCKtfCqyz

PROBLEM: cmOREbYSLRDagNYJjGZ, jIYSLRDagNXwXcq

SOLUTION:
YSLRDagN