def process_word(word: str, to_lower: bool = False,<EOL>append_case: Optional[str] = None) -> Tuple[str]:
if all(x.isupper() for x in word) and len(word) > <NUM_LIT:1>:<EOL><INDENT>uppercase = "<STR_LIT>"<EOL><DEDENT>elif word[<NUM_LIT:0>].isupper():<EOL><INDENT>uppercase = "<STR_LIT>"<EOL><DEDENT>else:<EOL><INDENT>uppercase = None<EOL><DEDENT>if to_lower:<EOL><INDENT>word = word.lower()<EOL><DEDENT>if word.isdigit():<EOL><INDENT>answer = ["<STR_LIT>"]<EOL><DEDENT>elif word.startswith("<STR_LIT>") or word.startswith("<STR_LIT>"):<EOL><INDENT>answer = ["<STR_LIT>"]<EOL><DEDENT>else:<EOL><INDENT>answer = list(word)<EOL><DEDENT>if to_lower and uppercase is not None:<EOL><INDENT>if append_case == "<STR_LIT>":<EOL><INDENT>answer = [uppercase] + answer<EOL><DEDENT>elif append_case == "<STR_LIT>":<EOL><INDENT>answer = answer + [uppercase]<EOL><DEDENT><DEDENT>return tuple(answer)<EOL>
Converts word to a tuple of symbols, optionally converts it to lowercase
    and adds capitalization label.

    Args:
        word: input word
        to_lower: whether to lowercase
        append_case: whether to add case mark
            ('<FIRST_UPPER>' for first capital and '<ALL_UPPER>' for all caps)

    Returns:
        a preprocessed word