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

Input: Consider Input: nxoXDohHr, WcbkXDohFbJ

Output: XDoh


Input: Consider Input: rEHxRBOktYreNkK, NCOktYreFFCFwi

Output: OktYre


Input: Consider Input: xcTgQcFpYyYvAWGq, cUGObbTgQcFpYyoJfBKw


Output: TgQcFpYy