7 lines
344 B
Python
7 lines
344 B
Python
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lines = open("input", "r").read().split("\n")
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import re
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matches = [re.match(r"^([0-9]+)-([0-9]+) ([a-z]): ([a-z]+)$", line) for line in lines]
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matches = [m for m in matches if m is not None]
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valids = [True for m in matches if (m.group(4)[int(m.group(1)) - 1] == m.group(3)) ^ (m.group(4)[int(m.group(2)) - 1] == m.group(3))]
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print(len(valids))
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