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:2018-04-23, Stock:RIO, The news for the past five days is as follows:
2018-04-16: NEWS1: What Updates Can Investors Expect from Alcoa’s Earnings Release?.NEWS2: What Could Drive Alcoa’s 1Q18 Financial Performance?.NEWS3: What Wall Street Expects from Alcoa’s 1Q18 Earnings.NEWS4: Why the Closure of CLF’s Australian Operations Could Be Positive.NEWS5: Why Cliffs’ Asia-Pacific Segment Could Disappoint Again in 1Q18.NEWS6: [$$] Rusal tumbles 21% as US vows to impose further sanctions on Russia.
2018-04-17: NEWS1: Rio Tinto first-quarter shipments rise 4.7 percent, maintains forecast.NEWS2: Rio Tinto Q1 Iron Ore Shipments Up 5%; Backs FY Iron Ore Shipments Outlook.NEWS3: Rio Tinto Q1 Iron Ore Shipments Up 5%; Backs FY Iron Ore Shipments Outlook.NEWS4: Sanctions batter Rusal's overseas supply chain, restructuring seen.NEWS5: Analysis: Sanctions batter Rusal's overseas supply chain, restructuring seen.NEWS6: Pre-Market Most Active for Apr 17, 2018 :  NFLX, TVIX, SQQQ, QQQ, GS, RIO, TWTR, BAC, BABA, CHK, GERN, ROKU.NEWS7: Pre-Market Most Active for Apr 17, 2018 :  NFLX, TVIX, SQQQ, QQQ, GS, RIO, TWTR, BAC, BABA, CHK, GERN, ROKU.NEWS8: How Wall Street Rates Alcoa ahead of Its 1Q18 Earnings Release.NEWS9: Russia Sanctions Throw Global Aluminum Industry Into Chaos.
2018-04-18: NEWS1: What to Watch for on Freeport-McMoRan’s 1Q18 Earnings Call.NEWS2: Will US-China Frictions Reflect in Freeport’s 1Q18 Earnings?.NEWS3: Can Freeport-McMoRan Beat Wall Street Revenue Estimates in 1Q18?.NEWS4: Freeport-McMoRan’s 1Q18 Earnings: The Word on Wall Street.NEWS5: What Are Analysts Expecting From Rio Tinto plc (LON:RIO) In The Next Couple Of Years?.NEWS6: Aluminum Prices Skyrocket on Sanction-Driven Global Supply Concerns.NEWS7: U.K. stocks rise as disappointing inflation eases pressure on BOE to hike.NEWS8: Energy Sector Update for 04/18/2018: USO, UNG, TOT, RIO.NEWS9: Energy Sector Update for 04/18/2018: USO, UNG, TOT, RIO.NEWS10: U.K. stocks rise as disappointing inflation eases pressure on BOE to hike.NEWS11: Miners lead FTSE 100 higher after Rio Tinto update; inflation data in focus.NEWS12: [$$] Rio Tinto Australian Iron-ore Shipments Rise 5%.NEWS13: Strategists Expect Euro-Zone Stocks to Rally Less.NEWS14: [$$] Rio Tinto smelter sales on track despite Rusal sanctions.NEWS15: Rio Tinto flags changes to 2018 aluminium output after U.S. sanctions.NEWS16: Rio Tinto Battles Fallout From Rusal Sanctions.
2018-04-19: NEWS1: BHP Trims Iron Ore Guidance—How Iron Ore Prices Could Respond.NEWS2: BHP Billiton (BHP) Lowers Iron-Ore Production View for FY18.NEWS3: BHP Billiton (BHP) Lowers Iron-Ore Production View for FY18.NEWS4: Analyzing Alcoa’s 1Q18 Earnings.NEWS5: BHP Billiton (BHP) Lowers Iron-Ore Production View for FY18.NEWS6: [$$] Energy stocks buoy indices as commodities rally.
2018-04-20: nan

Answer: Decrease