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

SOLUTION: XIE

PROBLEM: andNlOdIcQMyZvc, vCMENolkslOdIcQMyZJtCFo

SOLUTION: lOdIcQMyZ

PROBLEM: KPSCNtLBNC, HAASCNtLVgeJn

SOLUTION:
SCNtL