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

Input: Consider Input: zRwQdelc, UdAUwQdejhe

Output: wQde


Input: Consider Input: biAihydBoNlzR, IAloNhydBolwUz

Output: hydBo


Input: Consider Input: OIIBEf, UZIBFA


Output: IB