import numpy as np
from collections import deque

file = "inputs/day10.input"
lines = [x.decode().replace("\n", "") for x in open(file, "rb").readlines()]

match = {"<": ">", "(": ")", "[": "]", "{": "}"}
opening = ["<", "(", "[", "{"]
points = {">": 4, ")": 1, "]": 2, "}": 3}


def check_corruption(line):
    stack = deque("")
    for letter in line:
        if letter in opening:
            stack.append(letter)
        else:
            last_opening = stack.pop()
            if letter != match[last_opening]:
                return letter
    return "0"


def check_incomplete(line):
    stack = deque("")
    sequence = []
    for letter in line:
        if letter in opening:
            stack.append(letter)
        else:
            last_opening = stack.pop()
    while len(stack) != 0:
        current_opening = stack.pop()
        sequence.append(match[current_opening])
    return sequence


scores = []
for line in lines:
    score = 0
    corruption_check = check_corruption(line)
    if corruption_check != "0":
        score += points[corruption_check]
    else:
        closing_seq = check_incomplete(line)
        for letter in closing_seq:
            score *= 5
            score += points[letter]
        scores.append(score)

scores = sorted(scores)
print(scores[len(scores) // 2])