Definition: Classify the given a piece of financial news into three classes: positive, negative, and neutral. Output must be 'positive', 'negative', or 'neutral'.
Input: Tallink Silja attributes the significant drop to problems with the booking system that was taken into operation in October , the sale of trailer ferry ' Sky Wind ' and the route between Stockholm and Riga , which has won passengers from the Helsinki-Stockholm route .
Output:
negative