adventofcode-2020/06/part1

#!/usr/bin/python3

import string

sum = 0
with open("input") as fh:
    groups = fh.read().split("\n\n")
    for g in groups:
        yes = set()
        for c in g:
            if c in string.ascii_lowercase:
                yes.add(c)
        sum += len(yes)
print(sum)