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_XNproplJ):
Calculate -9 + 9.

Question 1 (Question id: q_S4XB8FU):
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: "computer"



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

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 integer answers, include 'half_answer' equal to answer ÷ 2.
If the response to a question is a string, add a 'first_char' field containing its first character.

Now provide the result JSON using the described format.

{"ground_truth": {"q_XNproplJ": {"answer": 0, "answer_type": "integer", "half_answer": 0}, "q_S4XB8FU": {"answer": "r", "answer_type": "string", "first_char": "r"}}}