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.

And what we experienced was pure-play e-commerce omnichannel as well as people that were open, such as Walmart and Target, that sell groceries, or Costco, the brick-and-mortar guys that were open, and grocery as a whole channel more than picked up from that and the demand from our products, as I mentioned.

Answer: operator: grocery, Walmart