In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: KKebLWQCQzVIojj, nxQCQzVIopD

Answer: QCQzVIo


Question: HiEuutntEBpU, fdkqEuutntEBABdGZRND

Answer: EuutntEB


Question: NjAxXVJikDgPLyT, BMVJikDgPMAcYcI

Answer:
VJikDgP