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

Input: Consider Input: sRpnJlgECTHh, JXfmNJlgECKyry

Output: JlgEC


Input: Consider Input: nTAXUw, OWAXYU

Output: AX


Input: Consider Input: thmfAholHEYhvTorrLkhYH, rKholHEYhvTtviZVJ


Output: holHEYhvT