Here are some positive and negative examples of strings in a formal language. Each example is on a separate line and follows the format "label: string", where "label" is either "0" or "1" (meaning negative or positive, respectively), and "string" is a sequence of symbols separated by spaces. A blank line indicates the end of the examples.

exemplars

Given these examples, predict the label (either "0" or "1") of the string after the text "string: " on the following line. If there is no text after "string: ", it represents the empty string. Do not provide any explanation, but respond only with the label "0" or "1". Do not use special markup for the label; just use the text "0" or "1" (without quotes).
string: test_string