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

Input: Consider Input: yQCDWefwvrPP, RwoMDWefwhSxTR

Output: DWefw


Input: Consider Input: mmDhYqPJC, qThYqxW

Output: hYq


Input: Consider Input: eIJTlIWzINUvK, lRQSonTlIWzICDa


Output: TlIWzI