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

Input: Consider Input: lMRuEThD, wqQRuEKp

Output: RuE


Input: Consider Input: DQVkAbWTTPhoBx, TeWTTPhonxcIKL

Output: WTTPho


Input: Consider Input: ZQxGKRxBGDBBocleIgdWvI, RzaDBBocleIgdHM


Output: DBBocleIgd