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

Input: Consider Input: bUcuzFgsdfojVR, IdcuzFgsdMRgtMA

Output: cuzFgsd

Input: Consider Input: pIkAtJHVcvzzZVz, btWerNSHVcvzzZTz

Output: HVcvzzZ

Input: Consider Input: ZxqqiMzpYNLs, TkeiMzpLTdi
Output: iMzp