def validate_input(user_input: str) -> bool:
    """ Takes a string and validates it against
    three criteria:
        1. The input is all lowercase (use variable.islower())
        2. It doesn't end with 'yeet'
        3. There are no q's in the input.
    
    Parameters
    ----------
    user_input:
        The value to validate.
    
    Returns
    -------
    True if none of the criteria are met and False
    if any are.
    """

    if not user_input.islower():
        return False

    if user_input.endswith("yeet"):
        return False
    
    if "q" or "Q" in user_input: # Check if q is a letter
        return False
    
    return True