14 lines
270 B
Python
14 lines
270 B
Python
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entry = set()
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total = 0
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with open("input") as f:
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for line in f:
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line = line.strip()
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if not line:
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total += len(entry)
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entry = set()
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else:
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entry = set(line) | set(entry)
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total += len(entry)
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print(total)
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