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

Input: Consider Input: rRmkmETbjzCzZZxihrVdefxfcenJ, ogQtzAgWjKCzZZxihrVdRswMCmngp

Output: CzZZxihrVd


Input: Consider Input: JKZiYILNeNQbJyznES, PHKILNeNQbJylltYH

Output: ILNeNQbJy


Input: Consider Input: nbHwGZyKfvkycIkS, PJfhZyKfvkmm


Output: ZyKfvk