#!/usr/bin/env python3
import sys
from typing import Sequence, Tuple


def part1(lines: Sequence[Tuple[str, int]]):
    horz = 0
    depth = 0
    for direction, amount in lines:
        if direction == "forward":
            horz += amount
        elif direction == "down":
            depth += amount
        elif direction == "up":
            depth -= amount
        else:
            assert False, f"not sure how to handle {direction}"
    print(f"horizontal position: {horz}")
    print(f"depth: {depth}")
    print(f"product: {depth * horz}")


def part2(lines: Sequence[Tuple[str, int]]):
    horz = 0
    depth = 0
    aim = 0
    for direction, amount in lines:
        if direction == "forward":
            horz += amount
            depth += aim * amount
        elif direction == "down":
            aim += amount
        elif direction == "up":
            aim -= amount
        else:
            assert False, f"not sure how to handle {direction}"
    print(f"horizontal position: {horz}")
    print(f"depth: {depth}")
    print(f"product: {depth * horz}")


lines = [(direction, int(amount)) for direction, amount in map(str.split, sys.stdin)]

print("Part 1")
part1(lines)
print("Part 2")
part2(lines)