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

SOLUTION: oOwfOl

PROBLEM: UvYbfKFybXofcwLRrLRiK, BgMZKFybXofcVe

SOLUTION: KFybXofc

PROBLEM: CAoYYdNFBkS, AdiOYYdNTzHf

SOLUTION:
YYdN