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

Input: Consider Input: fVEFJa, WtEFYK

Output: EF


Input: Consider Input: qQkmYsYN, UhkmYHSy

Output: kmY


Input: Consider Input: UeMgVTtv, eQigVTeBV


Output: gVT