Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: 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.

Banks reopened last Monday and Greece submitted a plan to the European Central Bank last week for an opinion before a decision was made by the Greek finance ministry which would allow the stock market to resume trading as early as Monday.The Athens Stock Exchange official said Greece needed more time to finalize the details which would allow the market to reopen based on ECB's opinion.

Answer: operator: stock market, Stock Exchange