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

Answer: dnwVDcnC


Question: yQRDycTycwH, ImycTycrR

Answer: ycTyc


Question: vyCLLCremCSSqSbs, BYBremCSSqwiLsM

Answer:
remCSSq