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

Input: Consider Input: cjDuPZOHjystHnF, okWVdUDuPZOHjSCaEecP

Output: DuPZOHj


Input: Consider Input: fCGEhfHvcRouHzNw, gtjBkhfHvcRouHee

Output: hfHvcRouH


Input: Consider Input: XzVhYnzEV, IqhYnhvv


Output: hYn