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

Input: Consider Input: LudFxiaqbX, UWMPnFxiaqikiDx

Output: Fxiaq


Input: Consider Input: koIZvrJmfKCO, TBvrtjcWIZvrJmfKRZDOE

Output: IZvrJmfK


Input: Consider Input: oiIeUCilHkKXJr, GWfBrneeUCilHklunRrHa


Output: eUCilHk