Here is a set of basic questions producing integer or string outputs. Answer them and format the result precisely with the JSON instructions provided:

Question 0 (Question id: q_SZPXj):
Your job is to return the last character of a string as a string. For example, the last char of "hello" is "o". Return the last character of the following string: "helps"

Question 1 (Question id: q_R2UK):
Calculate ( ( -5 * -4 ) ).



Your output must be a JSON mapping every question id to its answer info.

For every question id, supply an object whose 'answer' field stores the solution.
For even integers, nest 'half_answer' and 'double_answer' inside an additional 'additional_answer_info' field in the answer object.

Now provide the result JSON using the described format.

{"ground_truth": {"q_SZPXj": {"answer": "s"}, "q_R2UK": {"answer": 20, "additional_answer_info": {"half_answer": 10, "double_answer": 40}}}}