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

Input: Consider Input: xeKSiBafhOWBbYwlGaQ, GUfIsKgafhOWBbYiFWnptAt

Output: afhOWBbY


Input: Consider Input: hRVyvwHqnN, geHeyvwHqiBiYJ

Output: yvwHq


Input: Consider Input: cyfqmwOucOonW, fUwOucOzGIwP


Output: wOucO