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_MjRgd4h):
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: "why"

Question 1 (Question id: q_hXpW):
Solve for r: 18*r + 3 = 57 Respond with an integer.

Question 2 (Question id: q_Q2O7):
Determine the value of u that satisfies: 44*u + 5 = 841 Respond with an integer.



Produce a JSON object whose top-level keys are the question ids.

Each key’s value must be an object holding an 'answer' field.
Include an 'answer_type' field (value 'string' or 'integer') for every answer object.
For even integer answers, include 'half_answer' equal to answer ÷ 2.
For string answers, include 'first_char' with the answer’s initial letter.

Now provide the result JSON using the described format.

{"ground_truth": {"q_MjRgd4h": {"answer": "y", "answer_type": "string", "first_char": "y"}, "q_hXpW": {"answer": 3, "answer_type": "integer"}, "q_Q2O7": {"answer": 19, "answer_type": "integer"}}}