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

Input: Consider Input: IzwlZDJSEFPxfIud, xwWSYwlZDJSEFPbvSXTlS

Output: wlZDJSEFP


Input: Consider Input: biAihydBoNlzR, IAloNhydBolwUz

Output: hydBo


Input: Consider Input: sSGcRfeltUsJOiJR, MlwRfeltUjrWVXY


Output: RfeltU


