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

Input: Consider Input: eFUexDIFlaPDUwrOb, mTvkKGUxDIFlaPDUwxGVpnIwbi

Output: xDIFlaPDUw


Input: Consider Input: LJJvLTK, jpFJvLqh

Output: JvL


Input: Consider Input: ccYcWmChuRBEaRoQSzib, JiChuRBEaRoQHO


Output: ChuRBEaRoQ