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

Input: Consider Input: lypuwWy, jRpuwcE

Output: puw


Input: Consider Input: ztkWLUJQXxP, fYluOkWLUJKDX

Output: kWLUJ


Input: Consider Input: ZwbuAazbRypUHRxqSCV, XOazbRypUWRYIRf


Output: azbRypU