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: SsshKSaCuNzXzSTgVc, DNNYLWahKSaCuNzXnAjtq

Output: hKSaCuNzX


Input: Consider Input: PGESnjsfxyU, zkkqSnjsfqZ


Output: Snjsf