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:2019-10-30, Stock:RIO, The news for the past five days is as follows:
2019-10-23: NEWS1: Australia shares end flat as healthcare hurts, utilities batter NZ.NEWS2: Rio Tinto smelter closure risk rocks New Zealand's top power supplier.NEWS3: Premarket London:  Antofagasta Sees Modest Hit From Chile Riots.
2019-10-24: nan
2019-10-25: nan
2019-10-28: NEWS1: Miner Seeks Answers Amid Indonesia Nickel Shock: LME Week Update.
2019-10-29: nan

Answer: Decrease