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

Input: Consider Input: PShMbsbexXGlpBuMMDZZS, sVqGxSexXGlpBxuHXoI

Output: exXGlpB


Input: Consider Input: IobjElBjKvpepE, kRulBjKvvxU

Output: lBjKv


Input: Consider Input: McAoaKzynjcxBGYQhwoUg, btFBptkanjcxBGYQhUD


Output: njcxBGYQh