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

haOsaSQcyodWhqQaC, BKLEUQcyodWhvVkmxBz
QcyodWh

sdGIVJPsWWszKPCGk, ghRJPsWWszKcJUg
JPsWWszK

avbprNuPdfEldJJc, QmOjuPdfEldTxvPBNv

uPdfEld