from collections import Counter
from itertools import combinations


with open('data/02.txt') as f:
    data = [r.strip() for r in f]

totals = {2: 0, 3: 0}
for item in data:
    counter = Counter(item)
    for n in 2, 3:
        if n in counter.values():
            totals[n] += 1

print(f'Part 1:\n{totals[2] * totals[3]}\n')


def compare(a, b):
    different = 0
    for charA, charB in zip(a, b):
        if charA != charB:
            different += 1
        if different > 1:
            return False
    return True

for a, b in combinations(data, 2):
    if compare(a, b):
        print(''.join(c for c, d in zip(a, b) if c == d))