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

Input: Consider Input: rPPfxUdowLLdvwRtY, PuHovApkfxUdowLLBOhq

Output: fxUdowLL


Input: Consider Input: wCfNCfxvLRAxBstRTwMSqTn, AhwxfFNCfxvLRAxBrNtf

Output: NCfxvLRAxB


Input: Consider Input: xkOYjwfwlDyquulcFwg, GlxcAFkwlDyquulcFKdS


Output: wlDyquulcF