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

Input: Consider Input: wCfNCfxvLRAxBstRTwMSqTn, AhwxfFNCfxvLRAxBrNtf

Output: NCfxvLRAxB


Input: Consider Input: zqRbqwgmqGIAGTeeoGFOSr, RFnLqwgmqGIAGLcEvAWxY

Output: qwgmqGIAG


Input: Consider Input: plpBVEvNMNQLTOVkuWMexzlo, JnNQLTOVkuWSoVYtQ


Output: NQLTOVkuW