beautiful solution. Thank you

I am too new to Python to even start understanding a fraction of how this code works. It certainly looks a lot more compact than the code I wrote, but is it also more efficient than code written with explicit for loops and if statements, assuming that this code is in its optimum form?

Anyone know how to fix this?

Traceback (most recent call last):
File "main.py", line 1, in
from solution import *
File "/home/codewarrior/solution.py", line 20
SyntaxError: Non-ASCII character '\xc2' in file /home/codewarrior/solution.py on line 20, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details