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

Input: Consider Input: SQNzngllNbOkKDK, MijfNzngllNDfWge

Output: NzngllN


Input: Consider Input: RGImMTISYdkjzMO, pmyfpImMTISYdatLBBFr

Output: ImMTISYd


Input: Consider Input: zFsaCxCLPtzlP, trxeixCLPtzaoYq


Output: xCLPtz