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_VI9P):
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: "it"

Question 1 (Question id: q_nXjVl):
Calculate 4 - 5 * -1.

Question 2 (Question id: q_wZJr3YN):
How many times does the letter "b" appear in the text: "believed to"? Respond with an integer.

Question 3 (Question id: q_Dz4Y7):
Calculate ( 7 / 7 + 2 ).



Return a JSON with each question id as a key.

For every question id, supply an object whose 'answer' field stores the solution.
If the response to a question is an integer that is even, add the field 'additional_answer_info' containing 'half_answer' (answer ÷ 2) and 'double_answer' (answer × 2).
If the response to a question is a string, add a 'first_char' field containing its first character.
For last-character tasks, provide 'original_string' alongside the answer.

Now provide the result JSON using the described format.

{"ground_truth": {"q_VI9P": {"answer": "t", "first_char": "t", "original_string": "it"}, "q_nXjVl": {"answer": 9}, "q_wZJr3YN": {"answer": 1}, "q_Dz4Y7": {"answer": 3}}}