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

Input: Consider Input: Owbiay, exbime

Output: bi


Input: Consider Input: sRTQgRgRUjEooapKdR, vzsBgRUjEooLBkYeH

Output: gRUjEoo


Input: Consider Input: VIlQiLfl, yhXlQibh


Output: lQi