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:2021-08-19, Stock:RIO, The news for the past five days is as follows:
2021-08-12: nan
2021-08-13: nan
2021-08-16: NEWS1: 10 Russell 2000 Basic Materials Dividend Stocks to Buy.NEWS2: Are Investors Undervaluing Rio Tinto (RIO) Right Now?.
2021-08-17: NEWS1: Record Streak Stays Alive as Stocks Recover From Weak Start.
2021-08-18: nan

Answer: Decrease