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_egRxMkZ2):
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: "very"

Question 1 (Question id: q_ApY9n):
Determine the value of v that satisfies: 28*v = 420 Respond with an integer.

Question 2 (Question id: q_DuqAL):
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: "themselves"

Question 3 (Question id: q_QbjT):
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: "things"



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'.
For even integer answers, include 'half_answer' equal to answer ÷ 2.

Now provide the result JSON using the described format.

{"ground_truth": {"q_egRxMkZ2": {"answer": "y"}, "q_ApY9n": {"answer": 15}, "q_DuqAL": {"answer": "s"}, "q_QbjT": {"answer": "s"}}}