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_7UBl265):
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: "complex"

Question 1 (Question id: q_zJYF630E):
Calculate -4 * ( ( -3 + -1 ) ).

Question 2 (Question id: q_wLNcnYrQ):
Calculate 9 - -9 - -3.



Produce a JSON object whose top-level keys are the question ids.

The value for each key should be an object that contains the answer in the field 'answer'.
Include an 'answer_type' field (value 'string' or 'integer') for every answer object.
For even integers, nest 'half_answer' and 'double_answer' inside an additional 'additional_answer_info' field in the answer object.
If the question asks for the last character of a string, add an 'original_string' field containing the source string.

Now provide the result JSON using the described format.

{"ground_truth": {"q_7UBl265": {"answer": "x", "answer_type": "string", "original_string": "complex"}, "q_zJYF630E": {"answer": 16, "answer_type": "integer", "additional_answer_info": {"half_answer": 8, "double_answer": 32}}, "q_wLNcnYrQ": {"answer": 21, "answer_type": "integer"}}}