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

Input: Consider Input: VTwtMVKmrRvL, WLoVtWtMVKmrDCke

Output: tMVKmr


Input: Consider Input: AxAmDG, LTAmEV

Output: Am


Input: Consider Input: UZDpBLmHASe, GmBBLmHKP


Output: BLmH