from dataclasses import dataclass
from typing import Optional

MEASUREMENTS = (
    199,
    200,
    208,
    210,
    200,
    207,
    240,
    269,
    260,
    263,
)


@dataclass
class Sonar:
    last: Optional[int] = None

    def calc_measurement(self, new_measurement: int):
        if self.last is None:
            direction = 'N/A no previous measurement'
        else:
            if self.last < new_measurement:
                direction = 'increased'
            else:
                direction = 'decreased'

        print(f'{new_measurement}: {direction}')
        self.last = new_measurement


def main():
    sonar = Sonar()
    for measurement in MEASUREMENTS:
        sonar.calc_measurement(measurement)


if __name__ == '__main__':
    main()