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

Input: Consider Input: UtUSmsOI, dCUSmGoQ

Output: USm


Input: Consider Input: XYnCjAWPHHJ, gmCjAWPHpmwVsm

Output: CjAWPH


Input: Consider Input: sfFYEbvZG, KSXUFYEbdmCj


Output: FYEb