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

Input: Consider Input: yPODMimvyQPYWHfcM, aZiotMimvyQPZncH

Output: MimvyQP


Input: Consider Input: PivhPfah, XSghPfOi

Output: hPf


Input: Consider Input: txXgQKXAQUkbtBkkXkPvoJLe, kIupkzAQUkbtBkkZgF


Output: AQUkbtBkk