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_oYvPb):
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: "water"

Question 1 (Question id: q_BCt5):
Calculate 1 - -3.

Question 2 (Question id: q_wWcy):
Determine the value of o that satisfies: 18 - 4*o = 6 Respond with an integer.

Question 3 (Question id: q_rGh4):
Calculate 6 + 2 - -4.

Question 4 (Question id: q_f3JAh):
Your task is to count how many legs there are in total when given a list of animals.

Now, how many legs are there in total if you have 3 starfishs, 4 jellyfishs, 1 cockroach, 3 cows, 2 crabs?
 Respond with an integer.



Output JSON where all question ids are keys, omitting q_oYvPb.

Each key’s value must be an object holding an 'answer' field.
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).
For string answers, include 'first_char' with the answer’s initial letter.

Now provide the result JSON using the described format.

{"ground_truth": {"q_wWcy": {"answer": 3}, "q_BCt5": {"answer": 4, "additional_answer_info": {"half_answer": 2, "double_answer": 8}}, "q_rGh4": {"answer": 12, "additional_answer_info": {"half_answer": 6, "double_answer": 24}}, "q_f3JAh": {"answer": 53}}}