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

SOLUTION: loJanutXoO

PROBLEM: XWKEpwGRkfCFZGOyZQOoypx, lhQkmVqeRkfCFZGOyugPLqs

SOLUTION: RkfCFZGOy

PROBLEM: FgbCYyfstLQUGirPmoa, GABlPBqtLQUGirPmcskPls

SOLUTION:
tLQUGirPm