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

Input: Consider Input: OUNqomxFcLXhWdfB, gdqomxFcLHQPCu

Output: qomxFcL


Input: Consider Input: umXfmRnUgALpFAqBaKfNfo, aOAXWnUgALpFAqBmNpTCdj

Output: nUgALpFAqB


Input: Consider Input: JgldCCDvyUUBecx, MkCDvyUqtzBO


Output: CDvyU