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

Input: Consider Input: sHndIbPaygfNvnquxIHeteW, huLmJWXZIgfNvnquxIViQDhbuoL

Output: gfNvnquxI


Input: Consider Input: SODsrWUjUBSgA, WIWUjUBCUUs

Output: WUjUB


Input: Consider Input: ZhtjrWgbO, spistjrWghBsa


Output: tjrWg