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_qALgdUA):
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"

Question 1 (Question id: q_sMADw):
Calculate 1 + 0 + -1.

Question 2 (Question id: q_7usog):
Solve for r: 20*r - 20 = 240 Respond with an integer.

Question 3 (Question id: q_7XbjdGwk):
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: "biology"



Return a JSON with each question id as a key.

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.
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.

Now provide the result JSON using the described format.

{"ground_truth": {"q_qALgdUA": {"answer": "d", "answer_type": "string", "first_char": "d"}, "q_sMADw": {"answer": 0, "answer_type": "integer", "half_answer": 0}, "q_7usog": {"answer": 13, "answer_type": "integer"}, "q_7XbjdGwk": {"answer": "y", "answer_type": "string", "first_char": "y"}}}