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

Input: Consider Input: uZSRkFDHsGXNMaggxUn, lTrQKKpsGXNMaggEdSrEX

Output: sGXNMagg


Input: Consider Input: nrIHKzJCdAQzUDRBYpg, JDzJCdAQzUMMYrLcfO

Output: zJCdAQzU


Input: Consider Input: OuISgFEgHSAkp, BqggFEgHxjvWU


Output: gFEgH