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:VALE, The news for the past five days is as follows:
2018-12-17: nan
2018-12-18: NEWS1: Why Should You Add Mosaic (MOS) Stock to Your Portfolio?.NEWS2: Why Should You Add Mosaic (MOS) Stock to Your Portfolio?.NEWS3: Why Should You Add Mosaic (MOS) Stock to Your Portfolio?.
2018-12-19: NEWS1: Copper Throws Mixed Signals for Markets.NEWS2: Mining Stocks Look Dead unless China Stabilizes.NEWS3: Is Freeport-McMoRan Worth a Look Now?.
2018-12-20: nan
2018-12-21: nan

Answer: Decrease