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

Input: Consider Input: GlAYDsKQoXy, IxDsKQuK

Output: DsKQ


Input: Consider Input: dxqZUOvRprXyFfjQfTWBhR, biSVjOvRprXyFfDtuFWQ

Output: OvRprXyFf


Input: Consider Input: dlzequypR, Puequqv


Output: equ