Classify the given a piece of financial news into three classes: positive, negative, and neutral. Output must be 'positive', 'negative', or 'neutral'.

Input: Consider Input: The contracts have been signed to acquire uranium produced at the Sotkamo nickel-zinc mine in eastern Finland owned by Talvivaara .

Output: positive

Input: Consider Input: S&P has kept its '' sell '' rating , while Nordea and UBS have reaffirmed their '' buy '' recommendations .

Output: neutral

Input: Consider Input: Vacon 's cash flow from operations grew to EUR 37.1 mn from EUR 21.9 mn a year ago .
Output: positive