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

Input: Consider Input: VRamNL, mUamIB

Output: am


Input: Consider Input: CxwZWv, mkwZgM

Output: wZ


Input: Consider Input: GqJAekbyaihPcdqM, FTYRDDZAekbyaihsVnehg


Output: Aekbyaih