#!/usr/bin/env python3

import sys

if __name__ == '__main__':
    tuples = [[int(l) for l in line.strip('\n').split('   ')] for line in open(sys.argv[1])]
    first, second = [sorted(a) for a in zip(*tuples)]
            # first = []
            # second = []
            # for line in lines:
            #     f, s = line.split('   ')
            #     first.append(int(f))
            #     second.append(int(s))
            # first.sort()
            # second.sort()

    # challenge 1
    res1 = sum([abs(x-y) for (x,y) in zip(first, second)])
    print(f"challenge 1:\n{res1}\n")

    # challenge 2
    res2 = sum([x * second.count(x) for x in first])
    print(f"challenge 2:\n{res2}")