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

Input: Consider Input: yiKkIxbKvNk, znaIxbKggg

Output: IxbK


Input: Consider Input: HiGmCdXrmFRJYWLvZbpU, IxhkrmFRJYWLvZLaqRVxPkL

Output: rmFRJYWLvZ


Input: Consider Input: EAoEtUyJjUun, ocrYfUyJjUdmRL


Output: UyJjU