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_uiDM):
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: "humans"

Question 1 (Question id: q_tKU1G):
Calculate -6 - ( ( -3 + -4 ) ).

Question 2 (Question id: q_pIes):
How many times does the letter "r" appear in the text: "for the"? Respond with an integer.

Question 3 (Question id: q_kWfpdUA):
How many times does the letter "i" appear in the text: "sky which was"? Respond with an integer.



Return a JSON with each question id as a key.

Each key’s value must be an object holding an 'answer' field.
For even integer answers, include 'half_answer' equal to answer ÷ 2.
For last-character tasks, provide 'original_string' alongside the answer.

Now provide the result JSON using the described format.

{"ground_truth": {"q_uiDM": {"answer": "s", "original_string": "humans"}, "q_tKU1G": {"answer": 1}, "q_pIes": {"answer": 1}, "q_kWfpdUA": {"answer": 1}}}