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

SOLUTION: bi

PROBLEM: SODsrWUjUBSgA, WIWUjUBCUUs

SOLUTION: WUjUB

PROBLEM: qdVwQSWcJXNtVdHtxqwV, sKmLkNJXNtVdHtttlp

SOLUTION:
JXNtVdHt