Given the task definition and input, reply with output. 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.

Учёба настолько сурова,что мне не хватает 24 часов в сутках:(
sadness