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:2018-12-24, Stock:SBAC, The news for the past five days is as follows:
2018-12-17: nan
2018-12-18: NEWS1: See what the IHS Markit Score report has to say about SBA Communications Corp..
2018-12-19: nan
2018-12-20: NEWS1: SBA Communications Corporation to Speak at Citi’s 2019 Global TMT West Conference.NEWS2: See what the IHS Markit Score report has to say about SBA Communications Corp..
2018-12-21: NEWS1: SBAC Makes Notable Cross Below Critical Moving Average.NEWS2: SBAC Makes Notable Cross Below Critical Moving Average.

Answer: Decrease