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

Input: Consider Input: cvZfWOwa, xOfWOhZs

Output: fWO


Input: Consider Input: fVEFJa, WtEFYK

Output: EF


Input: Consider Input: ZaBbUtXJUnpQ, MTuBbUtXqEbgr


Output: BbUtX