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

oWwqraAz, uxTqraonu
qra

PivhPfah, XSghPfOi
hPf

YxoeVbehdmOLkIjOJWBH, zbeSdmOLkIjOJiWNTxc

dmOLkIjOJ