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_MjmFvv):
Calculate -3 * ( 9 * -5 ).

Question 1 (Question id: q_MLNHm):
Determine the value of u that satisfies: 44*u + 5 = 841 Respond with an integer.

Question 2 (Question id: q_l7Oh):
Calculate 3 - -5.



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'.
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 string answers, include 'first_char' with the answer’s initial letter.
For last-character tasks, provide 'original_string' alongside the answer.

Now provide the result JSON using the described format.

{"ground_truth": {"q_MjmFvv": {"answer": 135}, "q_MLNHm": {"answer": 19}, "q_l7Oh": {"answer": 8, "half_answer": 4}}}