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

Input: Consider Input: mCxQTIaXN, mWQTIaxzPT

Output: QTIa


Input: Consider Input: hRVyvwHqnN, geHeyvwHqiBiYJ

Output: yvwHq


Input: Consider Input: iHvgsbeFBNZgz, QMQlWFsbeFBNZRANWCFK


Output: sbeFBNZ