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

Input: Consider Input: YCAyruPTTHWhCYaiXfIl, OETdzqAyruPTTHWgS

Output: AyruPTTHW


Input: Consider Input: JXnHYuZvAYK, zhUYuZvASGhd

Output: YuZvA


Input: Consider Input: lmqjugDGvAvurXHQ, fjGvAvurXrGIbuu


Output: GvAvurX