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

Input: Consider Input: XqyPjqNZDEK, EfwPjqNgjIP

Output: PjqN


Input: Consider Input: DQVkAbWTTPhoBx, TeWTTPhonxcIKL

Output: WTTPho


Input: Consider Input: iJiXdf, OkiXbW


Output: iX