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

Input: Consider Input: lrBJDRkT, jmBJDrI

Output: BJD


Input: Consider Input: YHLJZrFQ, aSLJZQuo

Output: LJZ


Input: Consider Input: XbiJJDQMZuyyPuoEcDAygLi, xYZuyyPuoEcDqpCmat


Output: ZuyyPuoEcD