import re


def extract_tokens(sentence: str) -> list:
    """
    Extract tokens from input sentence conllu.

    Parameters
    ----------
    sentence: str
        Sentence on CoNLL-U format

    Retunrs
    -------
    list:
        List of tokens.
    """

    conllu_tokens_regex = r"^\d+(?:\-\d+)?\t([^\t]*)"
    tokens = re.findall(conllu_tokens_regex, sentence, re.MULTILINE)

    return tokens