class Machine:
    _state: int = 0

    def consume_character(self, char: str) -> None:
        if self._state == 0:
            if char == '1':
                self._state = 1
            else:
                self._state = 0
        elif self._state == 1:
            if char == '9':
                self._state = 2
            else:
                self._state = 0
        elif self._state == 2:
            if 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':
                self._state = 3
            else:
                self._state = 0
        elif self._state == 3:
            if 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':
                self._state = 4
            else:
                self._state = 0
        elif self._state == 4:
            if char == ' ':
                self._state = 5
            else:
                self._state = 0
        elif self._state == 5:
             if char == 'r':
                self._state = 6
             else:
                self._state = 0
        elif self._state == 6:
             if char == '.':
                self._state = 7
             else:
                self._state = 0


    def is_success_state(self) -> bool:
        return self._state == 7
    
    def restart(self) -> None:
        self._state = 0

def find_lines_with_date(text: str) -> list[int]:
    output: list[int] = []
    line_number = 0
    machine = Machine()
    for char in text:
        machine.consume_character(char)
        if char == '\n':
            if machine.is_success_state():
                output.append(line_number)
            machine.restart()
            line_number += 1
    if machine.is_success_state():
        output.append(line_number)
    line_number += 1
    return output


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

result = find_lines_with_date(text)
print(result)