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

Input: Consider Input: vhZuXCsIkQR, YflCuXCsIkLu

Output: uXCsIk


Input: Consider Input: nuwMzarLqoPvabJla, JKcrLqoPvabJNDCILGQ

Output: rLqoPvabJ


Input: Consider Input: LzXggsTmJClMVGZy, GTitHsTmJClMYY


Output: sTmJClM