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

SOLUTION: IZvrJmfK

PROBLEM: BeEgLISxThm, UGLISxEtP

SOLUTION: LISx

PROBLEM: fOTDCkwXJWoU, PlHvCkwXJWmaV

SOLUTION:
CkwXJW