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

Input: Consider Input: HiGmCdXrmFRJYWLvZbpU, IxhkrmFRJYWLvZLaqRVxPkL

Output: rmFRJYWLvZ


Input: Consider Input: NTINFnRckGsfLqhSoA, UUONcKKFnRckGsfLqVak

Output: FnRckGsfLq


Input: Consider Input: vbqshUoZwCtaEUXvvg, WxyhUoZwCtaEIGhG


Output: hUoZwCtaE