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: OVZxWYzAAxG, rStOxWYzJeoC

Output: xWYz


Input: Consider Input: EeeTKBGzdXFuZlB, DDKCEBGzdXFuZnzuKhql


Output: BGzdXFuZ