15 lines
273 B
Plaintext
15 lines
273 B
Plaintext
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#!/usr/bin/python3
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import string
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sum = 0
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with open("input") as fh:
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groups = fh.read().split("\n\n")
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for g in groups:
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yes = set()
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for c in g:
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if c in string.ascii_lowercase:
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yes.add(c)
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sum += len(yes)
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print(sum)
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