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

Ex Input:
aeQjEeiWGONmzGimhGiw, RIEeiWGONmOZuVYr

Ex Output:
EeiWGONm


Ex Input:
tftBHoDOYxCoTHVf, qhHoDOYxfUU

Ex Output:
HoDOYx


Ex Input:
lVVcozLYaXMgUKUmg, zZYMELYaXMgAYBJNa

Ex Output:

LYaXMg