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

Input: Consider Input: OgWFOfjNYmXVjBBvOdunIc, eGljKGnzFKFOfjNYmXVjdlqsT

Output: FOfjNYmXVj


Input: Consider Input: EyvnjbVLF, vqnjblzR

Output: njb


Input: Consider Input: SViVUJrVDTi, VmZVUJrXDm


Output: VUJr