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

Ex Input:
lLxXqKscqizXTO, TqrKscqizutDudo

Ex Output:
Kscqiz


Ex Input:
esIMEOgV, tNIMEybb

Ex Output:
IME


Ex Input:
hunyOJ, mOnyfK

Ex Output:

ny