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

Input: Consider Input: DnAzbgMtdPKsNCMpBfc, QdfXRkWREzbgMtdPKsGx

Output: zbgMtdPKs


Input: Consider Input: mmDhYqPJC, qThYqxW

Output: hYq


Input: Consider Input: RGImMTISYdkjzMO, pmyfpImMTISYdatLBBFr


Output: ImMTISYd