15 lines
247 B
Python
15 lines
247 B
Python
lines = (set(x.strip()) for x in open("input.txt"))
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current = set()
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count = 0
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for line in lines:
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if len(line) == 0:
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count += len(current)
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current = set()
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current = current.union(line)
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count += len(current)
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print(count)
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