def is_letter(_code : int) -> bool:
    """ Detect letter """
    lower : bool = _code >= 65 and _code <= 90
    upper : bool = _code >= 97 and _code <= 122
    #space_lowdash : bool = _code == 95 or _code == 32
    space : bool = _code == 32
    if lower or upper or space:
        return True
    return False