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

Input: Consider Input: pJqqIW, Ivqqxw

Output: qq


Input: Consider Input: NNpkdhvgT, BMkAkdhvrwV

Output: kdhv


Input: Consider Input: cSlPwpRi, vsglPwaB


Output: lPw