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

Ex Input:
QaxEaxdouNyyvNAn, wRjWSaxdouNyyrriQiG

Ex Output:
axdouNyy


Ex Input:
osmJJcZlDAXBgJFsJKa, rzPNlDAXBgJYrgXlH

Ex Output:
lDAXBgJ


Ex Input:
ZEdFdChToiHZLM, vlqddChToiHDTaNI

Ex Output:

dChToiH