type Report = tuple[int, ...]
type ReportList = list[Report]


def parse(filename: str) -> ReportList:
    report_list: ReportList = []
    with open(filename) as f:
        while line := f.readline().strip("\n"):
            report: Report = tuple(int(digit) for digit in line.split())
            report_list.append(report)
    return report_list


def is_safe(report: Report) -> bool:
    if not (report == tuple(sorted(report)) or report == tuple(sorted(report, reverse=True))):
        return False
    for i, value in enumerate(report[:-1]):
        if abs(value - report[i + 1]) > 3 or value == report[i + 1]:
            return False
    return True