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#!/usr/bin/python3
def cut(s: str) -> (str, str):
n = len(s) // 2
return s[:n], s[n:]
def process(line: str) -> int:
car, cdr = cut(line)
c = set(car).intersection(cdr).pop()
return ord(c) - ord('a') + 1 if c >= 'a' else ord(c) - ord('A') + 27
def main() -> None:
with open("input", "r") as f:
print(sum(process(line) for line in f.readlines()))
if __name__ == "__main__":
main()
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