def part1(text):
    return score(clean(text))


def clean(text: str) -> str:
    out = ""
    i = 0
    garbage = False
    while i < len(text):
        c = text[i]
        if c == "!":
            i += 2
            continue

        if garbage and c == ">":
            garbage = False
        elif garbage:
            pass
        elif c == "<":
            garbage = True
        else:
            out += c
        i += 1

    assert not garbage, "All garbage must be closed"
    return out


def score(text: str) -> int:
    depth = 0
    points = 0
    for c in text:
        if c == "{":
            depth += 1
        if c == "}":
            points += depth
            depth -= 1

    assert depth == 0, "All groups must be closed"
    return points


with open("input/day09.txt") as f:
    puzzle_input = f.read()

print(part1(puzzle_input))