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 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.
string: test_string