#!/usr/bin/env python3

import sys


def safe(report):
    if report == sorted(report) or report == sorted(report, reverse=True):
        start = report[0]
        for l in report[1:]:
            if 1 > abs(l-start) or 3 < abs(l-start): return False
            start = l
        return True
    return False


if __name__ == '__main__':
    reports = [[int(x) for x in line.strip('\n').split(' ')] for line in open(sys.argv[1])]

    # challenge 1
    saferep = sum([safe(r) for r in reports])
    res1 = saferep
    print(f"challenge 1:\n{res1}\n")

    # challenge 2
    for r in reports:
        if not safe(r):
            tolerate = False
            for i in range(len(r)):
                r1 = r[0:i] + r[i+1:len(r)]
                if safe(r1):
                    tolerate = True
                    break
            saferep += tolerate

    res2 = saferep
    print(f"challenge 2:\n{res2}")