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

Input: Consider Input: HaLZdTX, tLLZdEXN

Output: LZd


Input: Consider Input: oCtWZYdkvZ, pkktWZYdEHMW

Output: tWZYd


Input: Consider Input: ruSutYkwAKQYGp, GnBUJZutYkwAKDI


Output: utYkwAK