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

Input: Consider Input: XwBMFIV, SNLBMFZQ

Output: BMF


Input: Consider Input: gfDDsblwUryUw, UWaRisblwUTqTM

Output: sblwU


Input: Consider Input: UjShRswIbhzdbDP, awswIbhNa


Output: swIbh