#!/usr/bin/env python3

import sys


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

    # challenge 1
    res1 = ""
    print("challenge 1:" + "\n" +  res1 + "\n")

    # challenge 2
    res2 = ""
    print("challenge 2:" + "\n" +  res2 + "\n")