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

Input: Consider Input: kvutZfcPKzHE, kTKutZfcPTGmU

Output: utZfcP


Input: Consider Input: XWKEpwGRkfCFZGOyZQOoypx, lhQkmVqeRkfCFZGOyugPLqs

Output: RkfCFZGOy


Input: Consider Input: ClCNrLhpFJtGJlEimzigPmZAdL, VJpiHkDtGJlEimzigaEYxPuFU


Output: tGJlEimzig