Advent of Code 2020, now in the most terse and awful python possible
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#!/usr/bin/env python3
from sys import argv
i = [x.strip().split("\n") for x in open(argv[1]).read().split("\n\n")]
ok = 0
ok2 = 0
for g in i:
ci = set(g[0])
cx = set(g[0])
for p in g[1:]:
ci |= set(p)
cx &= set(p)
ok += len(ci)
ok2 += len(cx)
print(ok)
print(ok2)