What is the relationship between Aussie and SYDNEY in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

SYDNEY — Australia Post is facing a $500 million loss due to the collapse in the number of letters it handles, but the company has received a much-needed shot in the arm from the weaker Aussie dollar.

Answer: headquarters_location