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:2019-10-23, Stock:RIO, The news for the past five days is as follows:
2019-10-16: NEWS1: European shares tepid before Brexit talks resume.
2019-10-17: nan
2019-10-18: nan
2019-10-21: NEWS1: 6 Stocks Outperforming the Market.NEWS2: Norway’s $1 Trillion Fund Builds Rio Stake After Dirty Mine Sold.
2019-10-22: NEWS1: Rio to Produce Lithium in California, Joining Electric Car Battery Race.NEWS2: Rio Tinto has ‘eureka moment’ with California lithium discovery.NEWS3: Rio Tinto studying ways to produce lithium from waste rock at California mine.

Answer: Decrease