# Day 2
## Setup
```elixir
Mix.install([:kino])
```
```elixir
input =
Kino.Input.textarea("Paste input here",
default: """
forward 5
down 5
forward 8
up 3
down 8
forward 2
"""
)
```
```elixir
input =
input
|> Kino.Input.read()
|> String.split("\n", trim: true)
|> Stream.map(fn
"forward " <> x -> {:forward, String.to_integer(x)}
"down " <> x -> {:down, String.to_integer(x)}
"up " <> x -> {:up, String.to_integer(x)}
end)
```
## Part 1
```elixir
{h, d} =
input
|> Enum.reduce({0, 0}, fn
{:forward, x}, {h, d} -> {h + x, d}
{:down, x}, {h, d} -> {h, d + x}
{:up, x}, {h, d} -> {h, d - x}
end)
h * d
```
## Part 2
```elixir
{h, d, _aim} =
input
|> Enum.reduce({0, 0, 0}, fn
{:up, x}, {h, d, aim} -> {h, d, aim - x}
{:down, x}, {h, d, aim} -> {h, d, aim + x}
{:forward, x}, {h, d, aim} -> {h + x, d + aim * x, aim}
end)
h * d
```
