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

Input: Consider Input: cvZfWOwa, xOfWOhZs

Output: fWO


Input: Consider Input: TUAHhdvHIBxogI, LjfGsAHhdvHJcSdNV

Output: AHhdvH


Input: Consider Input: vMYfFo, EHYfnP


Output: Yf