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:2018-02-21, Stock:RIO, The news for the past five days is as follows:
2018-02-13: NEWS1: What Analysts Project for Freeport-McMoRan This Year.NEWS2: Can ArcelorMittal Succeed in India by Acquiring Essar Steel?.NEWS3: S&P upgrades Rio Tinto, flags well-placed for M&A.NEWS4: S&P upgrades Rio Tinto, flag well-placed for M&A.NEWS5: S&P upgrades Rio Tinto, flags well-placed for M&A.
2018-02-14: nan
2018-02-15: NEWS1: How Analysts Rate Southern Copper after 4Q17 Earnings.NEWS2: [$$] Rio Tinto appoints Royal Mail CEO to board.
2018-02-16: NEWS1: U.S. seeks to boost output of 35 minerals, reduce import reliance.NEWS2: How Much Could Alcoa's Stock Grow in 2018?.NEWS3: How Much Could Alcoa's Stock Grow in 2018?.NEWS4: Vale notches record iron ore output in 2017, sales slip.NEWS5: As mining investors push caution, Glencore differs from rivals.NEWS6: As mining investors push caution, Glencore differs from rivals.
2018-02-20: NEWS1: [$$] World’s Biggest Miners Emerge From Their Hole in a $200 Billion Comeback.NEWS2: Comparing Copper Miners’ 4Q17 Performance.NEWS3: How Important Is Grasberg To Freeport?.NEWS4: How Important Is Grasberg To Freeport?.NEWS5: Vale Full-Year 2017 Production Review: S11D Ramp-Up Propels Iron Ore Output To Record High.NEWS6: Vale Full-Year 2017 Production Review: S11D Ramp-Up Propels Iron Ore Output To Record High.NEWS7: Southern Copper wins tender for Peru's Michiquillay mine.NEWS8: Peru says 10 companies pre-registered for Michiquillay mine auction.NEWS9: Mongolia says can build power plant to supply Oyu Tolgoi mine.NEWS10: Does Rio Tinto plc’s (LON:RIO) 89.78% Earnings Growth Make It An Outperformer?.

Answer: Decrease