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#!/usr/bin/python3
from itertools import zip_longest
def grouper(xs: list[str], n: int) -> list[list[str]]:
args = [iter(xs)] * n
return zip_longest(*args)
def main() -> None:
with open("input", "r") as f:
data = f.readlines()
acc = 0
data = grouper(data, 3)
for group in data:
for c in group[0]:
if group[1].find(c) != -1 and group[2].find(c) != -1:
if 'a' <= c <= 'z':
acc += ord(c) - ord('a') + 1
else:
acc += ord(c) - ord('A') + 27
break
print(acc)
if __name__ == "__main__":
main()
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