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_hKsaV0):
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: "rainforests"

Question 1 (Question id: q_V1yy):
Calculate 4 - -5.

Question 2 (Question id: q_Xu0XD3d):
Calculate 2 - 0.

Question 3 (Question id: q_bxQ8W1):
Calculate ( 1 + 1 - 0 ).



Output JSON where all question ids are keys, omitting q_bxQ8W1.

Each key’s value must be an object holding an 'answer' field.
If the response to a question is an integer that is even, also add the field 'half_answer' to the object which contains the answer integer divided by two.
For last-character tasks, provide 'original_string' alongside the answer.

Now provide the result JSON using the described format.

{"ground_truth": {"q_hKsaV0": {"answer": "s", "original_string": "rainforests"}, "q_V1yy": {"answer": 9}, "q_Xu0XD3d": {"answer": 2, "half_answer": 1}}}