import re


def get_words(text):
    """
    Parameters:
        text: a string of text which needs to be processed
    Returns:
        string of all words extracted from the input string
    """
    text = text.lower()
    wordlist = text.split()
    clean_list = []
    for word in wordlist:
        # only get words (no digits)
        if re.match(r"^[a-z]+$", word):
            clean_list.append(word)
    return " ".join(clean_list)