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

Input: Consider Input: fAsWQxuyBevvLogrSrgg, tmdBEUxuyBevvLogXjiMCbh

Output: xuyBevvLog


Input: Consider Input: AuSFmN, crSFXM

Output: SF


Input: Consider Input: RDxdOJPXOwSjCY, zKGzEQJPXOwSvnP


Output: JPXOwS