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:2018-05-22, Stock:RIO, The news for the past five days is as follows:
2018-05-15: NEWS1: How Rusal escaped the noose of U.S. sanctions.NEWS2: How Rusal escaped the noose of U.S. sanctions.NEWS3: Freeport-McMoRan and Indonesia: The Tussle Gets Muddier.NEWS4: Rio Tinto CEO calls for 'United Nations of the mining world'.NEWS5: How Analysts Rate Freeport-McMoRan in May.NEWS6: How Analysts Rate Copper Miners after 1Q18 Earnings.NEWS7: [$$] Rio Tinto warns of threat from rising costs and resource nationalism.
2018-05-16: NEWS1: Insight: How Rusal escaped the noose of U.S. sanctions.NEWS2: How Rusal escaped the noose of U.S. sanctions.NEWS3: Brokerages Take a Fresh Look at First Quantum Minerals in May.NEWS4: How a Russian aluminum giant escaped the noose of U.S. sanctions.NEWS5: How Analysts Rate Antofagasta in 2Q18.NEWS6: Rio Tinto CEO calls for 'United Nations of the mining world'.NEWS7: How Rusal escaped the noose of U.S. sanctions.
2018-05-17: NEWS1: What’s Making Carl Icahn Bearish on Freeport-McMoRan?.
2018-05-18: NEWS1: Pan American Silver Corp. (PAAS) Ex-Dividend Date Scheduled for May 21, 2018.NEWS2: Pan American Silver Corp. (PAAS) Ex-Dividend Date Scheduled for May 21, 2018.
2018-05-21: nan

Answer: Decrease