import os

f = open(os.path.dirname(__file__)+"/input.txt", "r")

tot = 0
tot2 = 0

priorities = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
commons = ''

rucksacks = f.read().splitlines()
rucksacks2 = []

for data in rucksacks:
    left = data[:len(data)//2]
    right = data[len(data)//2:]

    common = ''.join(set(left).intersection(right))

    tot = tot + priorities.rfind(common)+1

print("First answer: " + str(tot))

start = 0
end = len(rucksacks)
step = 3
for i in range(start, end, step):

    three = rucksacks[i:i+step]
    common = set(three[0]) & set(three[1]) & set(three[2])
    tot2 = tot2 + priorities.rfind(''.join(common))+1

print("Second answer: " + str(tot2))