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

Input: Consider Input: IQIHqbEhpVuNATp, GIJIHqbEhpzWb

Output: IHqbEhp


Input: Consider Input: PGjDRPDzGaBR, rpIJRPDzWi

Output: RPDz


Input: Consider Input: QUZhIxZeCXLCNwdygOD, QaeZIebxlhIxZeCXLCjPxMdmf


Output: hIxZeCXLC