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

Ex Input:
HiEuutntEBpU, fdkqEuutntEBABdGZRND

Ex Output:
EuutntEB


Ex Input:
YHLJZrFQ, aSLJZQuo

Ex Output:
LJZ


Ex Input:
JyheaPKUOekCESEhslRAm, WBeaPKUOekCrP

Ex Output:

eaPKUOekC