Update input.py for octopus, since octopus requires block format as of version 11.

See https://octopus-code.org/new-site/develop/variables/output/output/

This should get the basic functionality, but won't catch much in the way of errors. Someone who is more familiar with the code base should review and add more if necessary. I tested the logic in a python repl but don't have a local on my machine and didn't test.