#!/usr/bin/env python3
import re
from collections import defaultdict

lines = (x.strip() for x in open("input.txt"))
REGEX = re.compile(r"((?:[a-z]+ )+)\(contains (.*)\)")

possible_ingredients = dict()
count = defaultdict(int)

for line in lines:
    ingredients, allergens = REGEX.match(line).groups()
    ingredients = set(ingredients.strip().split())
    for ing in ingredients:
        count[ing] += 1
    allergens = allergens.strip().split(", ")
    for allergen in allergens:
        if allergen in possible_ingredients:
            possible_ingredients[allergen].intersection_update(ingredients)
        else:
            possible_ingredients[allergen] = set(ingredients)

valids = set.union(*possible_ingredients.values())
print(sum(v for k, v in count.items() if k not in valids))