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

Answer: cYRVFFq


Question: IobjElBjKvpepE, kRulBjKvvxU

Answer: lBjKv


Question: wdwrYHYpQFYs, pzwRrYHYpCiJBv

Answer:
rYHYp