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

Ex Input:
cCDTMXjGMNikONun, jpcMXjGMNizBEWQzT

Ex Output:
MXjGMNi


Ex Input:
fCGEhfHvcRouHzNw, gtjBkhfHvcRouHee

Ex Output:
hfHvcRouH


Ex Input:
etovud, rRovAN

Ex Output:

ov