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_8X2SZ2I):
Find the value of o in the equation: 42*o = 378 Respond with an integer.

Question 1 (Question id: q_PjIOhj2o):
Calculate ( 9 - -7 + -1 ).



Your output must be a JSON mapping every question id to its answer info.

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, also add the field 'half_answer' to the object which contains the answer integer divided by two.
If the response to a question is a string, add a 'first_char' field containing its first character.
If the question asks for the last character of a string, add an 'original_string' field containing the source string.

Now provide the result JSON using the described format.

{"ground_truth": {"q_8X2SZ2I": {"answer": 9}, "q_PjIOhj2o": {"answer": 15}}}