Based on the news about the stock in the past five trading days, please predict the rise or fall of the stock in the next trading day. If the stock is predicted to rise in the next trading day, please output [Rise], if the stock is predicted to fall in the next trading day, please output [Decrease].

Date:2021-05-21, Stock:COST, The news for the past five days is as follows:
2021-05-14: nan
2021-05-17: NEWS1: CVS, Target Drop Face-Mask Rules for Fully Vaccinated Customers.NEWS2: Retailers loosen mask restrictions.NEWS3: Mask mandate: These retailers will now let you shop without a mask.NEWS4: Is Costco Wholesale Corporation's (NASDAQ:COST) Stock's Recent Performance A Reflection Of Its Financial Health?.
2021-05-18: NEWS1: Starbucks, Target, Trader Joe's are dropping mask rules. Why California is stopping them for now.NEWS2: BJ's Wholesale Club Earnings: What to Watch on Thursday.NEWS3: Worried About a Market Downturn? Buy This Forever Stock..
2021-05-19: NEWS1: Costco (COST) Dips More Than Broader Markets: What You Should Know.NEWS2: The revenge of the underpaid.NEWS3: What's in Store for The Children's Place (PLCE) in Q1 Earnings?.NEWS4: From Amazon to McDonald's, here's who's hiking wages amid the labor crunch.
2021-05-20: NEWS1: 2 Top Retail Apocalypse-Proof Stocks to Watch In May.NEWS2: Beat Inflation by Buying These 2 Stocks.

Answer: Decrease