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

Ex Input:
Nokia also noted the average selling price of handsets declined during the period , though its mobile phone profit margin rose to more than 22 percent from 13 percent in the year-ago quarter .

Ex Output:
positive

Ex Input:
Vaisala Oyj Press Release September 30 , 2010 Vaisala has signed a contract to sell its oxygen measurement technology and business to SICK Maihak GmbH .

Ex Output:
positive

Ex Input:
The estimated value of the contract is EUR12 .4 m. Vaisala , headquartered in Helsinki in Finland , develops and manufactures electronic measurement systems for meteorology , environmental sciences , traffic and industry .

Ex Output:
neutral