from typing import List


def remove_punc(sentences: List[List[str]]) -> List[List[str]]:
    """
    Remove punctuation from sentences.

    Parameters
    ----------
    sentences:
        List of tokenized sentences.
    """
    return [
        [
            "".join([c for c in word if c.isalpha()])
            for word in sentence
            if len(word) > 0
        ]
        for sentence in sentences
    ]