In Python,one of the tests is inaccurate.
Test.assert_equals(solve("your code rocks"),"skco redo cruoy")

I tried to import math, but I got error as below. If I don't import the function, same error occured.

Traceback:
in
in is_square
ValueError: math domain error

I coded in Python.

I tried to use "Set" but it seems something causing an error when compling. I can run my code when I copy and paste in to Eclipse though.
error messages are below:

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':compileJava'.

Compilation failed; see the compiler error output for details.