import sys
sys.path.append("../common")
import aoc

data = aoc.data.split("\n")

def solve1(args):
    doubles = 0
    triples = 0
    for s in data:
        counts = list((0,) * 26)
        for c in s:
            counts[ord(c[0])-97] += 1
        if 2 in counts:
            doubles += 1
        if 3 in counts:
            triples += 1
    return doubles * triples

def compare(s1, s2):
    dif = 0
    same = list()
    for i in range(len(s1)):
        if s1[i] != s2[i]:
            dif += 1
        else:
            same.append(s1[i])
    return (dif, same)

def solve2(args):
    for i in range(len(data)):
        for j in range(i, len(data)):
            if i == j:
                continue
            res = compare(data[i], data[j])
            if res[0] == 1:
                return "".join(res[1])


aoc.run(solve1, solve2, sols=[3952, "vtnikorkulbfejvyznqgdxpaw"])