class Machine:
    _state: int = 0
    _current_digital_substring: str = ''
    _results: list[str] = []

    def consume_character(self, char: str) -> None:
        if self._state == 0:
            if self._is_digit(char):
                self._state = 1
                self._current_digital_substring += char 
            elif not self._is_separator(char):
                self.state = 2
        elif self._state == 1:
            if self._is_digit(char):
                self._current_digital_substring += char 
            elif not self._is_separator(char):
                self.state = 2
                self._current_digital_substring = ''
            else:
                self.finish()
        elif self._state == 2:
            if self._is_separator(char):
                self.state = 0

    def _is_separator(self, char) -> bool:
        return char == '\n' or char == ' ' or char == '\t'

    def _is_digit(self, char: str) -> bool:
        return char == '1' or char == '2' or char == '3' or char == '4' or char == '5' or char == '6' or char == '7' or char == '8' or char == '9'

    def finish(self) -> None:
        if self._current_digital_substring != '':
            self._results.append(self._current_digital_substring)
        self._current_digital_substring = ''
        self._state = 0

    def get_results(self) -> list[int]:
        return self._results



text: str = None
with open('simple.exp', 'r', encoding='utf8') as file:
    text = file.read()

machine = Machine()
for c in text:
    machine.consume_character(c)
machine.finish()

print(machine.get_results())