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:2018-02-20, Stock:RIO, The news for the past five days is as follows:
2018-02-12: NEWS1: Do China’s Steel Demand Indicators Signal Slow Growth in 2018?.
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.

Answer: Decrease