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:2021-12-21, Stock:UNH, The news for the past five days is as follows:
2021-12-14: NEWS1: United Health Foundation Donates $500,000 to Support Kentucky Communities Devastated by Recent Tornadoes.NEWS2: Strategy Asset Managers Llc Buys Broadcom Inc, eBay Inc, Extra Space Storage Inc, Sells , Meta ....NEWS3: Change Healthcare Holdings LLC -- Moody's announces completion of a periodic review of ratings of Change Healthcare Holdings LLC.NEWS4: 2 Healthcare Stocks You Can Buy and Hold for the Next Decade.
2021-12-15: NEWS1: Dow Jones, Nasdaq Reverse Higher After Surprise Fed Decision; Defensive Sectors Outperform.NEWS2: AI Survey: Health Care Organizations Continue to Adopt Artificial Intelligence to Help Achieve Better, More Equitable and Affordable Patient Outcomes.
2021-12-16: nan
2021-12-17: NEWS1: Jefferies Group LLC Buys Fortress Transportation and Infrastructure Investo, Cedar Fair LP, ....NEWS2: PFM Multi-Manager Series Trust Buys Danaher Corp, Monolithic Power Systems Inc, Clorox Co, ....NEWS3: Teladoc (TDOC) Ties Up to Offer Virtual Care for NLA Members.
2021-12-20: NEWS1: UnitedHealth Group (UNH) Stock Moves -0.7%: What You Should Know.NEWS2: Market check: Stocks sink on stimulus blow, Omicron concerns.

Answer: Rise