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

Input: Consider Input: RinootTGLjbRGYznmBdH, oRMtTGLjbRGYzwEVHsjW

Output: tTGLjbRGYz


Input: Consider Input: fWJdaAfOCfejXZvidHM, gOpfOCfejXZbtLvSLZI

Output: fOCfejXZ


Input: Consider Input: kdxAekzTkuVC, usGekzTCKI


Output: ekzT