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:2021-12-22, Stock:RIO, The news for the past five days is as follows:
2021-12-15: NEWS1: New Strong Sell Stocks for December 15th.NEWS2: Is WisdomTree International Hedged Quality Dividend Growth ETF (IHDG) a Strong ETF Right Now?.
2021-12-16: nan
2021-12-17: NEWS1: Fidelity Destiny Portfolios Buys Salesforce. ....
2021-12-20: NEWS1: Rio Tinto selects new chairman after Juukan Gorge scandal.NEWS2: Rio Tinto puts call out to WA manufacturers to build iron ore rail cars.NEWS3: Rio Tinto Names Dominic Barton, Canada’s Ambassador to China, as Chairman.NEWS4: Rio Eyes China Relations as Ambassador Barton Named Chairman.
2021-12-21: NEWS1: Rio Tinto Buys $825 Million Lithium Project in Battery Push.NEWS2: Rio Tinto to acquire Rincon Mining lithium project.NEWS3: Rio Tinto Group's (LON:RIO) investors will be pleased with their solid 134% return over the last five years.

Answer: Decrease