25 lines
500 B
Python
25 lines
500 B
Python
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#!/usr/bin/env python
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import sys
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from collections import Counter
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def solve(input: str) -> int:
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def any_letter(boxes: list[str], count: int) -> int:
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return sum(count in Counter(box).values() for box in boxes)
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def checksum(boxes: list[str]) -> int:
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return any_letter(boxes, 2) * any_letter(boxes, 3)
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boxes = input.splitlines()
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return checksum(boxes)
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def main() -> None:
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input = sys.stdin.read()
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print(solve(input))
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if __name__ == "__main__":
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main()
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