13 lines
362 B
Python
13 lines
362 B
Python
qs = []
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with open("input.txt") as f:
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for q in f.read().split("\n\n"):
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s = {}
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q = list(filter(lambda x: x, q.split("\n")))
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ln = len(q)
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for a in q:
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for le in list(a):
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s[le] = s[le] + 1 if le in s else 1
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qs.append(list(filter(lambda x: s[x] == ln, s)))
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print(sum(map(lambda x: len(x), qs)))
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