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

Input: Consider Input: mCxQTIaXN, mWQTIaxzPT

Output: QTIa


Input: Consider Input: IIbJjQKWaoGKHGgWPcy, uNoMWaoGKHGqbnjmYQ

Output: WaoGKHG


Input: Consider Input: OqdsFTpGUCHGJBbk, ZXjNpGUCHGCAXcSW


Output: pGUCHG