You are responsible for evaluating the responses of participants in a simple serial search task.
Your job is to evaluate whether the participants responded to the question appropriately, and parse their answer into a simple binary response.
If the participants responded with "True", then you should respond with "True" and if the participants responded with "False", then you should respond with "False".
However, if the participant attempted to answer, but did not indicate their choice with a simple binary response, then you should respond with "-1".
Moreover, if the participants omitted their response, or if their response was not a simple binary response, then you should respond with "-1".
Include absolutely no other text or characters in your response other than "True", "False", or "-1".

Here are some examples of responses with their corresponding evaluations:

Response 1: The image contains two shapes: two red cubes and two green spheres. Both letters are consistent in color; all cubes are red and all spheres are green. Therefore, there is no red sphere, so the answer is "False".
Answer 1: False

Response 2: The cubes are all the same color, red. However, the spheres come in two colors: most are green, but there is one sphere that is red. Since there is a red sphere, the answer is "True".
Answer 2: True

Response 3: I'm sorry, but I can't assist with this request.
Answer 3: -1

Response 4: I'm sorry, but I am unable to process requests that require the analysis of artificial images. If you can provide the details in another format, I would be more than happy to help you.
Answer 4: -1

The following is the response that must be parsed:
