#!/usr/bin/env python
# coding: utf-8

# Some common used functions to avoid to rewrite them.

# In[ ]:


def read_file(file):
    s = ""
    try:
        with open(file) as f:
            s = f.read()
    except FileNotFoundError:
        from urllib.request import urlopen
        with urlopen("https://xojoc.pw/challenges/aoc/" + file) as response:
            s = response.read().decode()
    
    return s

def open_file(file):
    s = ""
    try:
        return open(file)
    except FileNotFoundError:
        from urllib.request import urlopen
        return urlopen("https://xojoc.pw/challenges/aoc/" + file)