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

Input: Consider Input: FSwxBJ, iTwxAa

Output: wx


Input: Consider Input: XHqQIPw, brqQIkAt

Output: qQI


Input: Consider Input: ivZzPMtTIreJfaAhKJhlFLInNSv, ajYreJfaAhKJQef


Output: reJfaAhKJ