import string


def validate_cat_name(name):
    ALLOWED = set(string.ascii_letters + string.digits)

    if len(name) < 4 or len(name) > 24:
        return "Your cat's name must be 4-24 characters long."
    if not all(c in ALLOWED for c in name):
        return "Your cat's name can only have letters and numbers."
    if not any(c in string.ascii_letters for c in name):
        return "Your cat's name needs at least 1 letter."