import fileinput
import itertools
from pprint import pprint
from typing import Any, Dict, List, Optional, Tuple


def parse() -> List[int]:
    line = next(fileinput.input()).strip()
    return [int(cup) for cup in line]


def step(cups: Dict[int, int], current_label: int, min_, max_) -> int:
    a = cups[current_label]
    b = cups[a]
    c = cups[b]
    picked_up: List[int] = [a, b, c]
    cups[current_label] = cups[c]

    destination = current_label - 1
    if destination < min_:
        destination = max_

    while destination in picked_up:
        destination -= 1
        if destination < min_:
            destination = max_

    cups[picked_up[2]] = cups[destination]
    cups[destination] = picked_up[0]
    return cups[current_label]


def part1(labels):
    cups = [None] * (len(labels) + 1)
    for i in range(len(labels)):
        cups[labels[i]] = labels[(i + 1) % len(labels)]

    current = labels[0]
    min_ = min(labels)
    max_ = max(labels)
    for _ in range(100):
        current = step(cups, current, min_, max_)

    label = 1
    print("Part 1: ", end="")
    for _ in range(8):
        label = cups[label]
        print(label, end="")
    print()

def part2(labels):
    labels = labels + [i for i in range(max(labels) + 1, 1_000_001)]
    cups = [0] * (len(labels) + 1)
    for i in range(len(labels)):
        cups[labels[i]] = labels[(i + 1) % len(labels)]

    current = labels[0]
    min_ = min(labels)
    max_ = max(labels)
    for turn in range(10_000_000):
        current = step(cups, current, min_, max_)

    a = cups[1]
    b = cups[a]
    print("Part 2:", a * b)


def main() -> None:
    labels = parse()
    part1(labels)
    part2(labels)


if __name__ == "__main__":
    main()