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

Input: Consider Input: vMYfFo, EHYfnP

Output: Yf


Input: Consider Input: VeLJEBYpZwxVQlo, EZEBYpZwxVQIxjFj

Output: EBYpZwxVQ


Input: Consider Input: lQwpMQRxuVbJDv, UkzwpMQRxuDVT


Output: wpMQRxu