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

Input: Consider Input: qczzCr, zDzzUI

Output: zz


Input: Consider Input: pIkAtJHVcvzzZVz, btWerNSHVcvzzZTz

Output: HVcvzzZ


Input: Consider Input: oZNKLmfxecDfkXEGFkRBYk, tReqkiExecDfkXEGtNZpJVRxC


Output: xecDfkXEG