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_4Ihd2PV):
Calculate -4 + 4.

Question 1 (Question id: q_OwOAL3z):
Your task is to count how many legs there are in total when given a list of animals.

Now, how many legs are there in total if you have 2 butterflys, 1 firefly, 2 shrimps, 3 humans?
 Respond with an integer.

Question 2 (Question id: q_Df57):
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: "and"



Return a JSON with each question id as a key.

The value for each key should be an object that contains the answer in the field 'answer'.
If the response to a question is an integer that is even, add the field 'additional_answer_info' containing 'half_answer' (answer ÷ 2) and 'double_answer' (answer × 2).
For animal-leg questions, add 'animal_types': an alphabetically-sorted list of unique animal names in singular form.

Now provide the result JSON using the described format.

{"ground_truth": {"q_4Ihd2PV": {"answer": 0, "additional_answer_info": {"half_answer": 0, "double_answer": 0}}, "q_OwOAL3z": {"answer": 44, "additional_answer_info": {"half_answer": 22, "double_answer": 88}, "animal_types": ["butterfly", "firefly", "human", "shrimp"]}, "q_Df57": {"answer": "d"}}}