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

Input: Consider Input: XmiLktrUjJDOCJ, UIKrUjJDOQsR

Output: rUjJDO


Input: Consider Input: pySBCdpe, AEBCdOR

Output: BCd


Input: Consider Input: ydWTZIaSYuJtFqwrlWHa, VhIaSYuJtFqGzRE


Output: IaSYuJtFq