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

Input: Consider Input: mOGzbnDXWnNurkBXtcqZ, NLahGzbnDXWnNYgMTOR

Output: GzbnDXWnN


Input: Consider Input: sJRFPufsaWXNeu, AePufsafc

Output: Pufsa


Input: Consider Input: GOnyuSkRvFarXw, JtlDnSkRvFasdCi


Output: SkRvFa