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

Input: Consider Input: BpGFyhLez, DfFyhuJY

Output: Fyh


Input: Consider Input: UiaECWZf, gRyaECWLGRl

Output: aECW


Input: Consider Input: rYnxuZxWTGSd, USIxuZxWTGRHP


Output: xuZxWTG