You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
You will be given a text in the Russian language, and you should classify the given input text to one of the emotion labels from this list of emotion labels- ['joy', 'sadness', 'surprise', 'fear', 'anger']. Make sure your output label (i) is strictly present in the given list of emotion labels. (ii) is unambiguous.

Кому они так необходимы, эти страдания?» А у меня спина болит, ходить больно :(
Solution: sadness
Why? The input text states the suffering of a person who is unable to walk as his back hurts. There is an emotion of 'sadness' in this text. So, the input text is labeled correctly as 'sadness'.

New input: А он его так долго изучал и всё удивлялся .
Solution:
surprise