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

Input: Consider Input: DnAzbgMtdPKsNCMpBfc, QdfXRkWREzbgMtdPKsGx

Output: zbgMtdPKs


Input: Consider Input: wYhGWdRC, cFGWdHEy

Output: GWd


Input: Consider Input: mUVgumVSHQJ, BPuGgumVSXwSgS


Output: gumVS