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

SOLUTION: FobZE

PROBLEM: plSfJAktMfac, TCjYJAktlt

SOLUTION: JAkt

PROBLEM: VPmQFmBAonOYCUqSclf, KKcAonOYCUqScydi

SOLUTION:
AonOYCUqSc