In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Example Input: UvYbfKFybXofcwLRrLRiK, BgMZKFybXofcVe
Example Output: KFybXofc

Example Input: zRwQdelc, UdAUwQdejhe
Example Output: wQde

Example Input: kTiymDAA, KEiymGkZ
Example Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
iym

