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# Advent 2022 - Day 6
```elixir
Mix.install([
{:kino, github: "livebook-dev/kino"}
])
```
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```
:ok
```
## Setup
```elixir
input = Kino.Input.textarea("Please paste your input file:")
```
```elixir
packets =
input
|> Kino.Input.read()
|> String.graphemes()
```
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```
["m", "j", "q", "j", "p", "q", "m", "g", "b", "l", "j", "s", "p", "h", "d", "z", "t", "n", "v", "j",
"f", "q", "w", "r", "c", "g", "s", "m", "l", "b"]
```
## Utils
```elixir
defmodule CommunicationDevice do
def find_first_duplicate(packets, chunk_size) do
index =
packets
|> Enum.chunk_every(chunk_size, 1, :discard)
|> Enum.map(&MapSet.new(&1))
|> Enum.with_index()
|> Enum.find(fn {set, _index} -> MapSet.size(set) == chunk_size end)
|> elem(1)
index + chunk_size
end
end
```
<!-- livebook:{"output":true} -->
```
{:module, CommunicationDevice, <<70, 79, 82, 49, 0, 0, 8, ...>>, {:find_first_duplicate, 2}}
```
## Part 1
```elixir
CommunicationDevice.find_first_duplicate(packets, 4)
```
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```
7
```
## Part 2
```elixir
CommunicationDevice.find_first_duplicate(packets, 14)
```
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```
19
```
