2020-12-06 11:51:37 +00:00
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groups = open("input", "r").read().split("\n\n")
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people = [[set(p) for p in g.split("\n") if p] for g in groups]
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2020-12-06 12:21:23 +00:00
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common = [set.intersection(*p) for p in people]
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2020-12-06 11:51:37 +00:00
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print(sum([len(c) for c in common]))
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