Note that in Ubuntu, default version for python is python2.
So in this assignment, we use python2 to decode the provided 50-SF.txt.
Run the decode.py in: py2_version.
If we want to use python3, we need to re-encode the 神奈川冲浪.jpg to 50-SF.txt, and then decode it using python3.
Run the demo.py in: py3_version.
