You are given labeled examples from a formal language. Each line is either:

label: symbol1 symbol2 symbol3 ...

Where:
- label is 1 (positive) or 0 (negative)
- A blank line marks the end of the examples.

Examples:

exemplars

Now, classify the string below by predicting its label (0 or 1). Use only 0 or 1 as your response—no explanation, no formatting.

string: test_string