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

Input: Consider Input: OezHeoe, ouUzHemU

Output: zHe


Input: Consider Input: cjDuPZOHjystHnF, okWVdUDuPZOHjSCaEecP

Output: DuPZOHj


Input: Consider Input: lRNqtU, rKNqSJ


Output: Nq