going back in time to work on Python3 with Advent of code 2015: https://adventofcode.com/2015
going back in time to work on Python3 with Advent of code 2015: https://adventofcode.com/2015
going back in time to work on Python3 with Advent of code 2015: https://adventofcode.com/2015
going back in time to work on Python3 with Advent of code 2015: https://adventofcode.com/2015