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

Input: Consider Input: lOedgdw, aoedgpn

Output: edg


Input: Consider Input: dsngGP, KvnglB

Output: ng


Input: Consider Input: CSssyyUjPyWqPOcKkf, uYYOnAPyUjPyWqSFKd


Output: yUjPyWq