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

Input: Consider Input: XYnCjAWPHHJ, gmCjAWPHpmwVsm

Output: CjAWPH


Input: Consider Input: AedXEOrEgvnzF, TVTEOrEgvxKuJgv

Output: EOrEgv


Input: Consider Input: PjQffFJ, pzQffisf


Output: Qff