Day1

Mix.install([
  {:kino, "~> 0.11.3"}
])

Part1

input1 = Kino.Input.textarea("Please enter the input here:")

input1
|> Kino.Input.read()
|> String.split("\n", trim: true)
|> Enum.map(&String.to_charlist(&1))
|> Enum.map(fn x -> Enum.filter(x, &amp;(&amp;1 >= 48 and &amp;1 <= 57)) end)
|> Enum.map(&amp;List.to_tuple(&amp;1))
|> Enum.map(fn tup ->
  first_digit = elem(tup, 0) - 48
  length = tuple_size(tup)
  last_digit = elem(tup, length - 1) - 48
  first_digit * 10 + last_digit
end)
|> Enum.sum()

55002

Part2

input2 = Kino.Input.textarea("Please enter the input here:")

defmodule Day1 do
  def main(inp) do
    inp
    |> String.split("\n", trim: true)
    |> Enum.map(fn x -> getFirstDigit(x) * 10 + getLastDigit(String.reverse(x)) end)
    |> Enum.sum()
  end

  def getFirstDigit(""), do: nil
  def getFirstDigit("1" <> _), do: 1
  def getFirstDigit("2" <> _), do: 2
  def getFirstDigit("3" <> _), do: 3
  def getFirstDigit("4" <> _), do: 4
  def getFirstDigit("5" <> _), do: 5
  def getFirstDigit("6" <> _), do: 6
  def getFirstDigit("7" <> _), do: 7
  def getFirstDigit("8" <> _), do: 8
  def getFirstDigit("9" <> _), do: 9
  def getFirstDigit("one" <> _), do: 1
  def getFirstDigit("two" <> _), do: 2
  def getFirstDigit("three" <> _), do: 3
  def getFirstDigit("four" <> _), do: 4
  def getFirstDigit("five" <> _), do: 5
  def getFirstDigit("six" <> _), do: 6
  def getFirstDigit("seven" <> _), do: 7
  def getFirstDigit("eight" <> _), do: 8
  def getFirstDigit("nine" <> _), do: 9
  def getFirstDigit(x), do: getFirstDigit(String.slice(x, 1..-1))

  def getLastDigit(""), do: nil
  def getLastDigit("1" <> _), do: 1
  def getLastDigit("2" <> _), do: 2
  def getLastDigit("3" <> _), do: 3
  def getLastDigit("4" <> _), do: 4
  def getLastDigit("5" <> _), do: 5
  def getLastDigit("6" <> _), do: 6
  def getLastDigit("7" <> _), do: 7
  def getLastDigit("8" <> _), do: 8
  def getLastDigit("9" <> _), do: 9
  def getLastDigit("eno" <> _), do: 1
  def getLastDigit("owt" <> _), do: 2
  def getLastDigit("eerht" <> _), do: 3
  def getLastDigit("ruof" <> _), do: 4
  def getLastDigit("evif" <> _), do: 5
  def getLastDigit("xis" <> _), do: 6
  def getLastDigit("neves" <> _), do: 7
  def getLastDigit("thgie" <> _), do: 8
  def getLastDigit("enin" <> _), do: 9
  def getLastDigit(x), do: getLastDigit(String.slice(x, 1..-1))
end

input2
|> Kino.Input.read()
|> Day1.main()

55093