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

Input: Consider Input: NmtypJ, tQtyZD

Output: ty


Input: Consider Input: nhGinCtvLartcMPhJwGRbpZNrq, iQJlFKayEartcMPhJwDRROB

Output: artcMPhJw


Input: Consider Input: MkgXBy, dcgXOy


Output: gX