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:2018-12-11, Stock:RDS-B, The news for the past five days is as follows:
2018-12-03: NEWS1: Royal Dutch Shell Buys Back $30 Mln Shares for Cancellation on Monday.NEWS2: Royal Dutch Shell Buys Back $30 Mln Shares for Cancellation on Monday.
2018-12-04: NEWS1: Energy Sector Update for 12/04/2018: TALO, GNE, RDS.A, RDS.B.NEWS2: Energy Sector Update for 12/04/2018: TALO, GNE, RDS.A, RDS.B.NEWS3: Market Chatter: Shell to Reportedly Start Production at Prelude Floating LNG Unit Around Year-End.NEWS4: Market Chatter: Shell to Reportedly Start Production at Prelude Floating LNG Unit Around Year-End.
2018-12-06: NEWS1: European Shares Slump After Huawei CFO Arrest.NEWS2: European Shares Slump After Huawei CFO Arrest.NEWS3: FTSE 100 Slumps On Trade, Brexit Worries.NEWS4: FTSE 100 Slumps On Trade, Brexit Worries.
2018-12-07: nan
2018-12-10: nan

Answer: Decrease